20634965 has 16 divisors (see below), whose sum is σ = 26761728. Its totient is φ = 15183936.

The previous prime is 20634959. The next prime is 20634997. The reversal of 20634965 is 56943602.

It is a cyclic number.

It is not a de Polignac number, because 20634965 - 2⁴ = 20634949 is a prime.

It is a Duffinian number.

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, 33692 + ... + 34298.

It is an arithmetic number, because the mean of its divisors is an integer number (1672608).

Almost surely, 2^20634965 is an apocalyptic number.

It is an amenable number.

20634965 is a deficient number, since it is larger than the sum of its proper divisors (6126763).

20634965 is a wasteful number, since it uses less digits than its factorization.

20634965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 20634965 is about 4542.5725090526. The cubic root of 20634965 is about 274.2844870538.

The spelling of 20634965 in words is "twenty million, six hundred thirty-four thousand, nine hundred sixty-five".