20831812 has 6 divisors (see below), whose sum is σ = 36455678. Its totient is φ = 10415904.

The previous prime is 20831807. The next prime is 20831821. The reversal of 20831812 is 21813802.

It can be written as a sum of positive squares in only one way, i.e., 20214016 + 617796 = 4496^2 + 786^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2603973 + ... + 2603980.

Almost surely, 2^20831812 is an apocalyptic number.

It is an amenable number.

20831812 is a deficient number, since it is larger than the sum of its proper divisors (15623866).

20831812 is a wasteful number, since it uses less digits than its factorization.

20831812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5207957 (or 5207955 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 20831812 is about 4564.1879891170. The cubic root of 20831812 is about 275.1539061355.

The spelling of 20831812 in words is "twenty million, eight hundred thirty-one thousand, eight hundred twelve".