31030423220 has 12 divisors (see below), whose sum is σ = 65163888804. Its totient is φ = 12412169280.

The previous prime is 31030423201. The next prime is 31030423241. The reversal of 31030423220 is 2232403013.

It can be written as a sum of positive squares in 2 ways, for example, as 16751607184 + 14278816036 = 129428^2 + 119494^2 .

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: 1551521161 = 31030423220 / (3 + 1 + 0 + 3 + 0 + 4 + 2 + 3 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 31030423192 and 31030423201.

It is a congruent number.

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, 775760561 + ... + 775760600.

It is an arithmetic number, because the mean of its divisors is an integer number (5430324067).

Almost surely, 2^31030423220 is an apocalyptic number.

It is an amenable number.

31030423220 is an abundant number, since it is smaller than the sum of its proper divisors (34133465584).

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

31030423220 is a wasteful number, since it uses less digits than its factorization.

31030423220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551521170 (or 1551521168 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 31030423220 its reverse (2232403013), we get a palindrome (33262826233).

The spelling of 31030423220 in words is "thirty-one billion, thirty million, four hundred twenty-three thousand, two hundred twenty".