20704957 has 24 divisors (see below), whose sum is σ = 26289536. Its totient is φ = 15877728.

The previous prime is 20704951. The next prime is 20704961. The reversal of 20704957 is 75940702.

It is not a de Polignac number, because 20704957 - 2⁷ = 20704829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20704951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 200968 + ... + 201070.

Almost surely, 2^20704957 is an apocalyptic number.

It is an amenable number.

20704957 is a deficient number, since it is larger than the sum of its proper divisors (5584579).

20704957 is a wasteful number, since it uses less digits than its factorization.

20704957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 20704957 is about 4550.2699919895. The cubic root of 20704957 is about 274.5942534295.

The spelling of 20704957 in words is "twenty million, seven hundred four thousand, nine hundred fifty-seven".