20213128 has 32 divisors (see below), whose sum is σ = 41025600. Its totient is φ = 9281088.

The previous prime is 20213107. The next prime is 20213183. The reversal of 20213128 is 82131202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26983 + ... + 27721.

It is an arithmetic number, because the mean of its divisors is an integer number (1282050).

Almost surely, 2^20213128 is an apocalyptic number.

It is an amenable number.

20213128 is an abundant number, since it is smaller than the sum of its proper divisors (20812472).

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

20213128 is a wasteful number, since it uses less digits than its factorization.

20213128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021 (or 1017 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 20213128 is about 4495.9012444670. The cubic root of 20213128 is about 272.4025541652.

The spelling of 20213128 in words is "twenty million, two hundred thirteen thousand, one hundred twenty-eight".