20128800 has 72 divisors (see below), whose sum is σ = 65527056. Its totient is φ = 5367040.

The previous prime is 20128793. The next prime is 20128837. The reversal of 20128800 is 882102.

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, 1794 + ... + 6593.

It is an arithmetic number, because the mean of its divisors is an integer number (910098).

Almost surely, 2^20128800 is an apocalyptic number.

20128800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20128800 is an abundant number, since it is smaller than the sum of its proper divisors (45398256).

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

20128800 is a wasteful number, since it uses less digits than its factorization.

20128800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8410 (or 8397 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 20128800 is about 4486.5131226822. The cubic root of 20128800 is about 272.0232102454.

The spelling of 20128800 in words is "twenty million, one hundred twenty-eight thousand, eight hundred".