20870800 has 30 divisors (see below), whose sum is σ = 50143058. Its totient is φ = 8348160.

The previous prime is 20870791. The next prime is 20870813. The reversal of 20870800 is 807802.

It can be written as a sum of positive squares in 3 ways, for example, as 331776 + 20539024 = 576^2 + 4532^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25689 + ... + 26488.

Almost surely, 2^20870800 is an apocalyptic number.

20870800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20870800 is an abundant number, since it is smaller than the sum of its proper divisors (29272258).

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

20870800 is a wasteful number, since it uses less digits than its factorization.

20870800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52195 (or 52184 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 20870800 is about 4568.4570699526. The cubic root of 20870800 is about 275.3254549016.

The spelling of 20870800 in words is "twenty million, eight hundred seventy thousand, eight hundred".