21920136 has 32 divisors (see below), whose sum is σ = 62629440. Its totient is φ = 6262848.

The previous prime is 21920113. The next prime is 21920141. The reversal of 21920136 is 63102912.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 65071 + ... + 65406.

It is an arithmetic number, because the mean of its divisors is an integer number (1957170).

Almost surely, 2^21920136 is an apocalyptic number.

It is an amenable number.

21920136 is an abundant number, since it is smaller than the sum of its proper divisors (40709304).

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

21920136 is a wasteful number, since it uses less digits than its factorization.

21920136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130493 (or 130489 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 21920136 is about 4681.8944883455. The cubic root of 21920136 is about 279.8644582073.

The spelling of 21920136 in words is "twenty-one million, nine hundred twenty thousand, one hundred thirty-six".