31032223220 has 12 divisors (see below), whose sum is σ = 65167668804. Its totient is φ = 12412889280.

The previous prime is 31032223199. The next prime is 31032223241. The reversal of 31032223220 is 2232223013.

It is an interprime number because it is at equal distance from previous prime (31032223199) and next prime (31032223241).

It can be written as a sum of positive squares in 2 ways, for example, as 9195659236 + 21836563984 = 95894^2 + 147772^2 .

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: 1551611161 = 31032223220 / (3 + 1 + 0 + 3 + 2 + 2 + 2 + 3 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 31032223192 and 31032223201.

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 3 ways as a sum of consecutive naturals, for example, 775805561 + ... + 775805600.

It is an arithmetic number, because the mean of its divisors is an integer number (5430639067).

Almost surely, 2^31032223220 is an apocalyptic number.

It is an amenable number.

31032223220 is an abundant number, since it is smaller than the sum of its proper divisors (34135445584).

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

31032223220 is a wasteful number, since it uses less digits than its factorization.

31032223220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551611170 (or 1551611168 counting only the distinct ones).

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

Adding to 31032223220 its reverse (2232223013), we get a palindrome (33264446233).

The spelling of 31032223220 in words is "thirty-one billion, thirty-two million, two hundred twenty-three thousand, two hundred twenty".