20657372 has 24 divisors (see below), whose sum is σ = 37462656. Its totient is φ = 9960048.

The previous prime is 20657347. The next prime is 20657383. The reversal of 20657372 is 27375602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13553 + ... + 14999.

It is an arithmetic number, because the mean of its divisors is an integer number (1560944).

Almost surely, 2^20657372 is an apocalyptic number.

It is an amenable number.

20657372 is a deficient number, since it is larger than the sum of its proper divisors (16805284).

20657372 is a wasteful number, since it uses less digits than its factorization.

20657372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577 (or 1575 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 20657372 is about 4545.0381736571. The cubic root of 20657372 is about 274.3837307288.

The spelling of 20657372 in words is "twenty million, six hundred fifty-seven thousand, three hundred seventy-two".