20118906 has 24 divisors (see below), whose sum is σ = 44415540. Its totient is φ = 6579456.

The previous prime is 20118881. The next prime is 20118911. The reversal of 20118906 is 60981102.

It can be written as a sum of positive squares in 2 ways, for example, as 16281225 + 3837681 = 4035^2 + 1959^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20118906.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9591 + ... + 11498.

Almost surely, 2^20118906 is an apocalyptic number.

20118906 is an abundant number, since it is smaller than the sum of its proper divisors (24296634).

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

20118906 is a wasteful number, since it uses less digits than its factorization.

20118906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21150 (or 21147 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 20118906 is about 4485.4103491208. The cubic root of 20118906 is about 271.9786333418.

The spelling of 20118906 in words is "twenty million, one hundred eighteen thousand, nine hundred six".