2815811020 has 48 divisors (see below), whose sum is σ = 6790291200. Its totient is φ = 970038720.

The previous prime is 2815810981. The next prime is 2815811023. The reversal of 2815811020 is 201185182.

It is a self number, because there is not a number n which added to its sum of digits gives 2815811020.

It is not an unprimeable number, because it can be changed into a prime (2815811023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332640 + ... + 340999.

It is an arithmetic number, because the mean of its divisors is an integer number (141464400).

Almost surely, 2^2815811020 is an apocalyptic number.

2815811020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2815811020 is an abundant number, since it is smaller than the sum of its proper divisors (3974480180).

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

2815811020 is a wasteful number, since it uses less digits than its factorization.

2815811020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673678 (or 673676 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 2815811020 is about 53064.2160028771. The cubic root of 2815811020 is about 1412.1077441610.

The spelling of 2815811020 in words is "two billion, eight hundred fifteen million, eight hundred eleven thousand, twenty".