20313538 has 48 divisors (see below), whose sum is σ = 38228760. Its totient is φ = 8042496.

The previous prime is 20313511. The next prime is 20313563. The reversal of 20313538 is 83531302.

It can be written as a sum of positive squares in 4 ways, for example, as 17698849 + 2614689 = 4207^2 + 1617^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148206 + ... + 148342.

Almost surely, 2^20313538 is an apocalyptic number.

20313538 is a deficient number, since it is larger than the sum of its proper divisors (17915222).

20313538 is a wasteful number, since it uses less digits than its factorization.

20313538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20313538 is about 4507.0542486196. The cubic root of 20313538 is about 272.8528683407.

The spelling of 20313538 in words is "twenty million, three hundred thirteen thousand, five hundred thirty-eight".