20155974 has 16 divisors (see below), whose sum is σ = 40570608. Its totient is φ = 6675552.

The previous prime is 20155951. The next prime is 20155987. The reversal of 20155974 is 47955102.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9757 + ... + 11640.

It is an arithmetic number, because the mean of its divisors is an integer number (2535663).

Almost surely, 2^20155974 is an apocalyptic number.

20155974 is an abundant number, since it is smaller than the sum of its proper divisors (20414634).

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

20155974 is a wasteful number, since it uses less digits than its factorization.

20155974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21559.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 20155974 is about 4489.5405110100. The cubic root of 20155974 is about 272.1455661867.

The spelling of 20155974 in words is "twenty million, one hundred fifty-five thousand, nine hundred seventy-four".