20837802820 has 48 divisors (see below), whose sum is σ = 44971098480. Its totient is φ = 8104610304.

The previous prime is 20837802809. The next prime is 20837802871. The reversal of 20837802820 is 2820873802.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 194435136 + 20643367684 = 13944^2 + 143678^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1256422 + ... + 1272898.

It is an arithmetic number, because the mean of its divisors is an integer number (936897885).

Almost surely, 2^20837802820 is an apocalyptic number.

20837802820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20837802820 is an abundant number, since it is smaller than the sum of its proper divisors (24133295660).

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

20837802820 is a wasteful number, since it uses less digits than its factorization.

20837802820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18232 (or 18230 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The spelling of 20837802820 in words is "twenty billion, eight hundred thirty-seven million, eight hundred two thousand, eight hundred twenty".