20315031220 has 72 divisors (see below), whose sum is σ = 47139047424. Its totient is φ = 7348440000.

The previous prime is 20315031203. The next prime is 20315031299. The reversal of 20315031220 is 2213051302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 440245 + ... + 484195.

It is an arithmetic number, because the mean of its divisors is an integer number (654708992).

Almost surely, 2^20315031220 is an apocalyptic number.

20315031220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20315031220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23569523712).

20315031220 is an abundant number, since it is smaller than the sum of its proper divisors (26824016204).

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

20315031220 is a wasteful number, since it uses less digits than its factorization.

20315031220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44173 (or 44160 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

Adding to 20315031220 its reverse (2213051302), we get a palindrome (22528082522).

The spelling of 20315031220 in words is "twenty billion, three hundred fifteen million, thirty-one thousand, two hundred twenty".