31211230020 has 48 divisors (see below), whose sum is σ = 87520644288. Its totient is φ = 8310689920.

The previous prime is 31211230003. The next prime is 31211230021. The reversal of 31211230020 is 2003211213.

It is a super-2 number, since 2×31211230020² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (31211230021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343566 + ... + 424805.

It is an arithmetic number, because the mean of its divisors is an integer number (1823346756).

Almost surely, 2^31211230020 is an apocalyptic number.

31211230020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31211230020 is an abundant number, since it is smaller than the sum of its proper divisors (56309414268).

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

31211230020 is a wasteful number, since it uses less digits than its factorization.

31211230020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769060 (or 769058 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31211230020 its reverse (2003211213), we get a palindrome (33214441233).

The spelling of 31211230020 in words is "thirty-one billion, two hundred eleven million, two hundred thirty thousand, twenty".