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20918000 = 245310459
BaseRepresentation
bin100111111001…
…0111011110000
31110100202002202
41033302323300
520323334000
62024202332
7342541265
oct117627360
943322082
1020918000
1110898004
1270093a8
13444521c
142ac726c
151c82dd5
hex13f2ef0

20918000 has 40 divisors (see below), whose sum is σ = 50584560. Its totient is φ = 8366400.

The previous prime is 20917999. The next prime is 20918011. The reversal of 20918000 is 81902.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3230 + ... + 7229.

It is an arithmetic number, because the mean of its divisors is an integer number (1264614).

Almost surely, 220918000 is an apocalyptic number.

20918000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20918000 is an abundant number, since it is smaller than the sum of its proper divisors (29666560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20918000 is a wasteful number, since it uses less digits than its factorization.

20918000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10482 (or 10466 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 20918000 is about 4573.6200104512. The cubic root of 20918000 is about 275.5328511566.

Adding to 20918000 its reverse (81902), we get a palindrome (20999902).

The spelling of 20918000 in words is "twenty million, nine hundred eighteen thousand".

Divisors: 1 2 4 5 8 10 16 20 25 40 50 80 100 125 200 250 400 500 1000 2000 10459 20918 41836 52295 83672 104590 167344 209180 261475 418360 522950 836720 1045900 1307375 2091800 2614750 4183600 5229500 10459000 20918000