20310131220 has 48 divisors (see below), whose sum is σ = 57420504960. Its totient is φ = 5363450496.

The previous prime is 20310131161. The next prime is 20310131227. The reversal of 20310131220 is 2213101302.

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 20310131220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20310131227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1637035 + ... + 1649394.

It is an arithmetic number, because the mean of its divisors is an integer number (1196260520).

Almost surely, 2^20310131220 is an apocalyptic number.

20310131220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20310131220 is an abundant number, since it is smaller than the sum of its proper divisors (37110373740).

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

20310131220 is a wasteful number, since it uses less digits than its factorization.

20310131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3286544 (or 3286542 counting only the distinct ones).

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

Adding to 20310131220 its reverse (2213101302), we get a palindrome (22523232522).

The spelling of 20310131220 in words is "twenty billion, three hundred ten million, one hundred thirty-one thousand, two hundred twenty".