20957588 has 6 divisors (see below), whose sum is σ = 36675786. Its totient is φ = 10478792.

The previous prime is 20957561. The next prime is 20957593. The reversal of 20957588 is 88575902.

It can be written as a sum of positive squares in only one way, i.e., 10640644 + 10316944 = 3262^2 + 3212^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2619695 + ... + 2619702.

It is an arithmetic number, because the mean of its divisors is an integer number (6112631).

Almost surely, 2^20957588 is an apocalyptic number.

It is an amenable number.

20957588 is a deficient number, since it is larger than the sum of its proper divisors (15718198).

20957588 is a wasteful number, since it uses less digits than its factorization.

20957588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5239401 (or 5239399 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 20957588 is about 4577.9458275519. The cubic root of 20957588 is about 275.7065599341.

The spelling of 20957588 in words is "twenty million, nine hundred fifty-seven thousand, five hundred eighty-eight".