20455880 has 32 divisors (see below), whose sum is σ = 46899000. Its totient is φ = 8027136.

The previous prime is 20455873. The next prime is 20455891. The reversal of 20455880 is 8855402.

It can be written as a sum of positive squares in 4 ways, for example, as 14394436 + 6061444 = 3794^2 + 2462^2 .

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, 2705 + ... + 6944.

Almost surely, 2^20455880 is an apocalyptic number.

20455880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20455880 is an abundant number, since it is smaller than the sum of its proper divisors (26443120).

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

20455880 is a wasteful number, since it uses less digits than its factorization.

20455880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9713 (or 9709 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 20455880 is about 4522.8177058113. The cubic root of 20455880 is about 273.4887014105.

The spelling of 20455880 in words is "twenty million, four hundred fifty-five thousand, eight hundred eighty".