13811351220 has 36 divisors (see below), whose sum is σ = 41894432580. Its totient is φ = 3683026944.

The previous prime is 13811351207. The next prime is 13811351227. The reversal of 13811351220 is 2215311831.

13811351220 is a `hidden beast` number, since 1 + 38 + 113 + 512 + 2 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5103102096 + 8708249124 = 71436^2 + 93318^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13811351227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38364685 + ... + 38365044.

Almost surely, 2^13811351220 is an apocalyptic number.

13811351220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13811351220 is an abundant number, since it is smaller than the sum of its proper divisors (28083081360).

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

13811351220 is a wasteful number, since it uses less digits than its factorization.

13811351220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76729744 (or 76729739 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 13811351220 in words is "thirteen billion, eight hundred eleven million, three hundred fifty-one thousand, two hundred twenty".