20901534 has 16 divisors (see below), whose sum is σ = 44262288. Its totient is φ = 6557312.

The previous prime is 20901509. The next prime is 20901581. The reversal of 20901534 is 43510902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102357 + ... + 102560.

It is an arithmetic number, because the mean of its divisors is an integer number (2766393).

Almost surely, 2^20901534 is an apocalyptic number.

20901534 is an abundant number, since it is smaller than the sum of its proper divisors (23360754).

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

20901534 is a wasteful number, since it uses less digits than its factorization.

20901534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204939.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20901534 is about 4571.8195502447. The cubic root of 20901534 is about 275.4605352104.

The spelling of 20901534 in words is "twenty million, nine hundred one thousand, five hundred thirty-four".