20957490 has 24 divisors (see below), whose sum is σ = 54489708. Its totient is φ = 5588640.

The previous prime is 20957479. The next prime is 20957491. The reversal of 20957490 is 9475902.

It can be written as a sum of positive squares in 2 ways, for example, as 20493729 + 463761 = 4527^2 + 681^2 .

It is not an unprimeable number, because it can be changed into a prime (20957491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116341 + ... + 116520.

Almost surely, 2^20957490 is an apocalyptic number.

20957490 is an abundant number, since it is smaller than the sum of its proper divisors (33532218).

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

20957490 is a wasteful number, since it uses less digits than its factorization.

20957490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232874 (or 232871 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20957490 is about 4577.9351240488. The cubic root of 20957490 is about 275.7061301886.

The spelling of 20957490 in words is "twenty million, nine hundred fifty-seven thousand, four hundred ninety".