20605965 has 16 divisors (see below), whose sum is σ = 33388800. Its totient is φ = 10850112.

The previous prime is 20605939. The next prime is 20605967. The reversal of 20605965 is 56950602.

It is not a de Polignac number, because 20605965 - 2⁵ = 20605933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20605967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7510 + ... + 9879.

It is an arithmetic number, because the mean of its divisors is an integer number (2086800).

Almost surely, 2^20605965 is an apocalyptic number.

It is an amenable number.

20605965 is a deficient number, since it is larger than the sum of its proper divisors (12782835).

20605965 is a wasteful number, since it uses less digits than its factorization.

20605965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17476.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 20605965 is about 4539.3793628645. The cubic root of 20605965 is about 274.1559353570.

The spelling of 20605965 in words is "twenty million, six hundred five thousand, nine hundred sixty-five".