20657965 has 16 divisors (see below), whose sum is σ = 25401600. Its totient is φ = 16123072.

The previous prime is 20657929. The next prime is 20657983. The reversal of 20657965 is 56975602.

It is a cyclic number.

It is not a de Polignac number, because 20657965 - 2⁷ = 20657837 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70359 + ... + 70651.

It is an arithmetic number, because the mean of its divisors is an integer number (1587600).

Almost surely, 2^20657965 is an apocalyptic number.

It is an amenable number.

20657965 is a deficient number, since it is larger than the sum of its proper divisors (4743635).

20657965 is a wasteful number, since it uses less digits than its factorization.

20657965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596.

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 20657965 is about 4545.1034091646. The cubic root of 20657965 is about 274.3863562321.

The spelling of 20657965 in words is "twenty million, six hundred fifty-seven thousand, nine hundred sixty-five".