11513200820 has 36 divisors (see below), whose sum is σ = 26575517892. Its totient is φ = 4186617600.

The previous prime is 11513200771. The next prime is 11513200871. The reversal of 11513200820 is 2800231511.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8480936464 + 3032264356 = 92092^2 + 55066^2 .

It is a congruent number.

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, 2376341 + ... + 2381180.

Almost surely, 2^11513200820 is an apocalyptic number.

11513200820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11513200820 is an abundant number, since it is smaller than the sum of its proper divisors (15062317072).

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

11513200820 is a wasteful number, since it uses less digits than its factorization.

11513200820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4757552 (or 4757539 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The spelling of 11513200820 in words is "eleven billion, five hundred thirteen million, two hundred thousand, eight hundred twenty".