20310031220 has 24 divisors (see below), whose sum is σ = 42689296104. Its totient is φ = 8116730496.

The previous prime is 20310031213. The next prime is 20310031243. The reversal of 20310031220 is 2213001302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 581581456 + 19728449764 = 24116^2 + 140458^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20310031195 and 20310031204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 432227 + ... + 476906.

It is an arithmetic number, because the mean of its divisors is an integer number (1778720671).

Almost surely, 2^20310031220 is an apocalyptic number.

20310031220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20310031220 is an abundant number, since it is smaller than the sum of its proper divisors (22379264884).

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

20310031220 is a wasteful number, since it uses less digits than its factorization.

20310031220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910259 (or 910257 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 20310031220 its reverse (2213001302), we get a palindrome (22523032522).

The spelling of 20310031220 in words is "twenty billion, three hundred ten million, thirty-one thousand, two hundred twenty".