20656804 has 48 divisors (see below), whose sum is σ = 43036672. Its totient is φ = 8491392.

The previous prime is 20656799. The next prime is 20656847. The reversal of 20656804 is 40865602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131494 + ... + 131650.

Almost surely, 2^20656804 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20656804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21518336).

20656804 is an abundant number, since it is smaller than the sum of its proper divisors (22379868).

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

20656804 is a wasteful number, since it uses less digits than its factorization.

20656804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 20656804 is about 4544.9756875037. The cubic root of 20656804 is about 274.3812158657.

The spelling of 20656804 in words is "twenty million, six hundred fifty-six thousand, eight hundred four".