20013131220 has 48 divisors (see below), whose sum is σ = 58473152640. Its totient is φ = 5104798336.

The previous prime is 20013131213. The next prime is 20013131231. The reversal of 20013131220 is 2213131002.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20013131220.

It is a congruent number.

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, 7249755 + ... + 7252514.

It is an arithmetic number, because the mean of its divisors is an integer number (1218190680).

Almost surely, 2^20013131220 is an apocalyptic number.

20013131220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20013131220 is an abundant number, since it is smaller than the sum of its proper divisors (38460021420).

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

20013131220 is a wasteful number, since it uses less digits than its factorization.

20013131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14502304 (or 14502302 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20013131220 its reverse (2213131002), we get a palindrome (22226262222).

The spelling of 20013131220 in words is "twenty billion, thirteen million, one hundred thirty-one thousand, two hundred twenty".