20456880 has 40 divisors (see below), whose sum is σ = 63417072. Its totient is φ = 5455104.

The previous prime is 20456879. The next prime is 20456941. The reversal of 20456880 is 8865402.

It is a tau number, because it is divible by the number of its divisors (40).

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, 42379 + ... + 42858.

Almost surely, 2^20456880 is an apocalyptic number.

20456880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20456880 is an abundant number, since it is smaller than the sum of its proper divisors (42960192).

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

20456880 is a wasteful number, since it uses less digits than its factorization.

20456880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85253 (or 85247 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 20456880 is about 4522.9282550136. The cubic root of 20456880 is about 273.4931579001.

The spelling of 20456880 in words is "twenty million, four hundred fifty-six thousand, eight hundred eighty".