| Base | Representation |
|---|---|
| bin | 100110101000… |
| … | …0001111100100 |
| 3 | 1102002220000000 |
| 4 | 1031100033210 |
| 5 | 20141022440 |
| 6 | 2002021300 |
| 7 | 334064424 |
| oct | 115201744 |
| 9 | 42086000 |
| 10 | 20251620 |
| 11 | 10482384 |
| 12 | 6947830 |
| 13 | 4270b0c |
| 14 | 2992484 |
| 15 | 1ba0730 |
| hex | 13503e4 |
20251620 has 96 divisors (see below), whose sum is σ = 63920640. Its totient is φ = 5388768.
The previous prime is 20251619. The next prime is 20251631. The reversal of 20251620 is 2615202.
20251620 is a `hidden beast` number, since 20 + 25 + 1 + 620 = 666.
It is a super-2 number, since 2×202516202 = 820256225248800, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a junction number, because it is equal to n+sod(n) for n = 20251593 and 20251602.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43509 + ... + 43971.
It is an arithmetic number, because the mean of its divisors is an integer number (665840).
Almost surely, 220251620 is an apocalyptic number.
20251620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20251620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31960320).
20251620 is an abundant number, since it is smaller than the sum of its proper divisors (43669020).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20251620 is an equidigital number, since it uses as much as digits as its factorization.
20251620 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 493 (or 473 counting only the distinct ones).
The product of its (nonzero) digits is 240, while the sum is 18.
The square root of 20251620 is about 4500.1799964001. The cubic root of 20251620 is about 272.5753572134.
Adding to 20251620 its reverse (2615202), we get a palindrome (22866822).
The spelling of 20251620 in words is "twenty million, two hundred fifty-one thousand, six hundred twenty".
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