20657496 has 32 divisors (see below), whose sum is σ = 53890560. Its totient is φ = 6586272.

The previous prime is 20657491. The next prime is 20657537. The reversal of 20657496 is 69475602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20657491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18160 + ... + 19263.

It is an arithmetic number, because the mean of its divisors is an integer number (1684080).

Almost surely, 2^20657496 is an apocalyptic number.

It is an amenable number.

20657496 is an abundant number, since it is smaller than the sum of its proper divisors (33233064).

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

20657496 is a wasteful number, since it uses less digits than its factorization.

20657496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37455 (or 37451 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 20657496 is about 4545.0518148862. The cubic root of 20657496 is about 274.3842797421.

The spelling of 20657496 in words is "twenty million, six hundred fifty-seven thousand, four hundred ninety-six".