20957589 has 16 divisors (see below), whose sum is σ = 32683200. Its totient is φ = 13236048.

The previous prime is 20957561. The next prime is 20957593. The reversal of 20957589 is 98575902.

It is a happy number.

It is not a de Polignac number, because 20957589 - 2⁹ = 20957077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20957509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19914 + ... + 20939.

It is an arithmetic number, because the mean of its divisors is an integer number (2042700).

Almost surely, 2^20957589 is an apocalyptic number.

It is an amenable number.

20957589 is a deficient number, since it is larger than the sum of its proper divisors (11725611).

20957589 is a wasteful number, since it uses less digits than its factorization.

20957589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40881 (or 40875 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 20957589 is about 4577.9459367712. The cubic root of 20957589 is about 275.7065643192.

The spelling of 20957589 in words is "twenty million, nine hundred fifty-seven thousand, five hundred eighty-nine".