20957064 has 32 divisors (see below), whose sum is σ = 53178720. Its totient is φ = 6880896.

The previous prime is 20957033. The next prime is 20957077. The reversal of 20957064 is 46075902.

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, 4909 + ... + 8124.

It is an arithmetic number, because the mean of its divisors is an integer number (1661835).

Almost surely, 2^20957064 is an apocalyptic number.

20957064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20957064 is an abundant number, since it is smaller than the sum of its proper divisors (32221656).

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

20957064 is a wasteful number, since it uses less digits than its factorization.

20957064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13109 (or 13105 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 20957064 is about 4577.8885962854. Note that the first 3 decimals coincide. The cubic root of 20957064 is about 275.7042620958.

The spelling of 20957064 in words is "twenty million, nine hundred fifty-seven thousand, sixty-four".