20257146 has 96 divisors (see below), whose sum is σ = 55036800. Its totient is φ = 5242752.

The previous prime is 20257121. The next prime is 20257163. The reversal of 20257146 is 64175202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 135880 + ... + 136028.

It is an arithmetic number, because the mean of its divisors is an integer number (573300).

Almost surely, 2^20257146 is an apocalyptic number.

20257146 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20257146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27518400).

20257146 is an abundant number, since it is smaller than the sum of its proper divisors (34779654).

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

20257146 is a wasteful number, since it uses less digits than its factorization.

20257146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20257146 is about 4500.7939299639. The cubic root of 20257146 is about 272.6001472375.

The spelling of 20257146 in words is "twenty million, two hundred fifty-seven thousand, one hundred forty-six".