20853800 has 48 divisors (see below), whose sum is σ = 52898400. Its totient is φ = 7582400.

The previous prime is 20853799. The next prime is 20853803. The reversal of 20853800 is 835802.

It is a self number, because there is not a number n which added to its sum of digits gives 20853800.

It is not an unprimeable number, because it can be changed into a prime (20853803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2540 + ... + 6939.

It is an arithmetic number, because the mean of its divisors is an integer number (1102050).

Almost surely, 2^20853800 is an apocalyptic number.

20853800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20853800 is an abundant number, since it is smaller than the sum of its proper divisors (32044600).

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

20853800 is a wasteful number, since it uses less digits than its factorization.

20853800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9506 (or 9497 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20853800 is about 4566.5961065108. The cubic root of 20853800 is about 275.2506805098.

It can be divided in two parts, 2085 and 3800, that added together give a palindrome (5885).

The spelling of 20853800 in words is "twenty million, eight hundred fifty-three thousand, eight hundred".