31223323220 has 12 divisors (see below), whose sum is σ = 65568978804. Its totient is φ = 12489329280.

The previous prime is 31223323121. The next prime is 31223323279. The reversal of 31223323220 is 2232332213.

It can be written as a sum of positive squares in 2 ways, for example, as 13193279044 + 18030044176 = 114862^2 + 134276^2 .

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, 780583061 + ... + 780583100.

It is an arithmetic number, because the mean of its divisors is an integer number (5464081567).

Almost surely, 2^31223323220 is an apocalyptic number.

It is an amenable number.

31223323220 is an abundant number, since it is smaller than the sum of its proper divisors (34345655584).

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

31223323220 is a wasteful number, since it uses less digits than its factorization.

31223323220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561166170 (or 1561166168 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 31223323220 its reverse (2232332213), we get a palindrome (33455655433).

The spelling of 31223323220 in words is "thirty-one billion, two hundred twenty-three million, three hundred twenty-three thousand, two hundred twenty".