31103242220 has 12 divisors (see below), whose sum is σ = 65316808704. Its totient is φ = 12441296880.

The previous prime is 31103242151. The next prime is 31103242259. The reversal of 31103242220 is 2224230113.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1555162111 = 31103242220 / (3 + 1 + 1 + 0 + 3 + 2 + 4 + 2 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 31103242192 and 31103242201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 777581036 + ... + 777581075.

It is an arithmetic number, because the mean of its divisors is an integer number (5443067392).

Almost surely, 2^31103242220 is an apocalyptic number.

It is an amenable number.

31103242220 is an abundant number, since it is smaller than the sum of its proper divisors (34213566484).

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

31103242220 is a wasteful number, since it uses less digits than its factorization.

31103242220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555162120 (or 1555162118 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31103242220 its reverse (2224230113), we get a palindrome (33327472333).

The spelling of 31103242220 in words is "thirty-one billion, one hundred three million, two hundred forty-two thousand, two hundred twenty".