20757164 has 6 divisors (see below), whose sum is σ = 36325044. Its totient is φ = 10378580.

The previous prime is 20757157. The next prime is 20757167. The reversal of 20757164 is 46175702.

It is a self number, because there is not a number n which added to its sum of digits gives 20757164.

It is not an unprimeable number, because it can be changed into a prime (20757167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2594642 + ... + 2594649.

It is an arithmetic number, because the mean of its divisors is an integer number (6054174).

Almost surely, 2^20757164 is an apocalyptic number.

It is an amenable number.

20757164 is a deficient number, since it is larger than the sum of its proper divisors (15567880).

20757164 is a wasteful number, since it uses less digits than its factorization.

20757164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5189295 (or 5189293 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 20757164 is about 4556.0030728699. The cubic root of 20757164 is about 274.8248537631.

The spelling of 20757164 in words is "twenty million, seven hundred fifty-seven thousand, one hundred sixty-four".