20881404 has 36 divisors (see below), whose sum is σ = 53053000. Its totient is φ = 6924960.

The previous prime is 20881381. The next prime is 20881433. The reversal of 20881404 is 40418802.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×20881404² = 872066066022432, which contains 22 as substring.

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, 6222 + ... + 8970.

Almost surely, 2^20881404 is an apocalyptic number.

It is an amenable number.

20881404 is an abundant number, since it is smaller than the sum of its proper divisors (32171596).

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

20881404 is a wasteful number, since it uses less digits than its factorization.

20881404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2970 (or 2965 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 20881404 is about 4569.6174894623. The cubic root of 20881404 is about 275.3720759672.

The spelling of 20881404 in words is "twenty million, eight hundred eighty-one thousand, four hundred four".