20113213220 has 24 divisors (see below), whose sum is σ = 42456604344. Its totient is φ = 8003598336.

The previous prime is 20113213207. The next prime is 20113213231. The reversal of 20113213220 is 2231231102.

It can be written as a sum of positive squares in 4 ways, for example, as 4484713024 + 15628500196 = 66968^2 + 125014^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2601479 + ... + 2609198.

It is an arithmetic number, because the mean of its divisors is an integer number (1769025181).

Almost surely, 2^20113213220 is an apocalyptic number.

20113213220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20113213220 is an abundant number, since it is smaller than the sum of its proper divisors (22343391124).

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

20113213220 is a wasteful number, since it uses less digits than its factorization.

20113213220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5210879 (or 5210877 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20113213220 its reverse (2231231102), we get a palindrome (22344444322).

The spelling of 20113213220 in words is "twenty billion, one hundred thirteen million, two hundred thirteen thousand, two hundred twenty".