20831264 has 24 divisors (see below), whose sum is σ = 41968080. Its totient is φ = 10172736.

The previous prime is 20831249. The next prime is 20831267. The reversal of 20831264 is 46213802.

It is not an unprimeable number, because it can be changed into a prime (20831267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6194 + ... + 8945.

It is an arithmetic number, because the mean of its divisors is an integer number (1748670).

Almost surely, 2^20831264 is an apocalyptic number.

It is an amenable number.

20831264 is an abundant number, since it is smaller than the sum of its proper divisors (21136816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20831264 is a wasteful number, since it uses less digits than its factorization.

20831264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15192 (or 15184 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20831264 is about 4564.1279561380. The cubic root of 20831264 is about 275.1514933887.

The spelling of 20831264 in words is "twenty million, eight hundred thirty-one thousand, two hundred sixty-four".