20057656 has 32 divisors (see below), whose sum is σ = 39853440. Its totient is φ = 9443808.

The previous prime is 20057629. The next prime is 20057659. The reversal of 20057656 is 65675002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20057659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11515 + ... + 13141.

It is an arithmetic number, because the mean of its divisors is an integer number (1245420).

Almost surely, 2^20057656 is an apocalyptic number.

It is an amenable number.

20057656 is a deficient number, since it is larger than the sum of its proper divisors (19795784).

20057656 is a wasteful number, since it uses less digits than its factorization.

20057656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723 (or 1719 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 20057656 is about 4478.5774527187. The cubic root of 20057656 is about 271.7023488496.

The spelling of 20057656 in words is "twenty million, fifty-seven thousand, six hundred fifty-six".