20831404 has 12 divisors (see below), whose sum is σ = 39769128. Its totient is φ = 9468800.

The previous prime is 20831323. The next prime is 20831533. The reversal of 20831404 is 40413802.

It is a super-2 number, since 2×20831404² = 867894785222432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236677 + ... + 236764.

It is an arithmetic number, because the mean of its divisors is an integer number (3314094).

Almost surely, 2^20831404 is an apocalyptic number.

It is an amenable number.

20831404 is a deficient number, since it is larger than the sum of its proper divisors (18937724).

20831404 is a wasteful number, since it uses less digits than its factorization.

20831404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473456 (or 473454 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20831404 is about 4564.1432931055. The cubic root of 20831404 is about 275.1521097879.

The spelling of 20831404 in words is "twenty million, eight hundred thirty-one thousand, four hundred four".