20887065 has 24 divisors (see below), whose sum is σ = 37547328. Its totient is φ = 11139120.

The previous prime is 20887063. The next prime is 20887079. The reversal of 20887065 is 56078802.

It is not a de Polignac number, because 20887065 - 2¹ = 20887063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20887063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7381 + ... + 9810.

It is an arithmetic number, because the mean of its divisors is an integer number (1564472).

Almost surely, 2^20887065 is an apocalyptic number.

It is an amenable number.

20887065 is a deficient number, since it is larger than the sum of its proper divisors (16660263).

20887065 is an equidigital number, since it uses as much as digits as its factorization.

20887065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17211 (or 17199 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 20887065 is about 4570.2368647588. The cubic root of 20887065 is about 275.3969584012.

The spelling of 20887065 in words is "twenty million, eight hundred eighty-seven thousand, sixty-five".