31000231020 has 48 divisors (see below), whose sum is σ = 94691616768. Its totient is φ = 7515207360.

The previous prime is 31000230991. The next prime is 31000231021. The reversal of 31000231020 is 2013200013.

It is a happy number.

It is a super-2 number, since 2×31000231020² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 31000230987 and 31000231005.

It is not an unprimeable number, because it can be changed into a prime (31000231021) 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, 23484364 + ... + 23485683.

It is an arithmetic number, because the mean of its divisors is an integer number (1972742016).

Almost surely, 2^31000231020 is an apocalyptic number.

31000231020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31000231020 is an abundant number, since it is smaller than the sum of its proper divisors (63691385748).

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

31000231020 is a wasteful number, since it uses less digits than its factorization.

31000231020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46970070 (or 46970068 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 31000231020 its reverse (2013200013), we get a palindrome (33013431033).

The spelling of 31000231020 in words is "thirty-one billion, two hundred thirty-one thousand, twenty".