20117031894 has 24 divisors (see below), whose sum is σ = 43593668352. Its totient is φ = 6704636400.

The previous prime is 20117031817. The next prime is 20117031901. The reversal of 20117031894 is 49813071102.

It is a happy number.

It is a congruent number.

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, 37227 + ... + 204009.

It is an arithmetic number, because the mean of its divisors is an integer number (1816402848).

Almost surely, 2^20117031894 is an apocalyptic number.

20117031894 is an abundant number, since it is smaller than the sum of its proper divisors (23476636458).

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

20117031894 is a wasteful number, since it uses less digits than its factorization.

20117031894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173492 (or 173489 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 20117031894 in words is "twenty billion, one hundred seventeen million, thirty-one thousand, eight hundred ninety-four".