31132123020 has 72 divisors (see below), whose sum is σ = 94488934176. Its totient is φ = 8297079552.

The previous prime is 31132123013. The next prime is 31132123021. The reversal of 31132123020 is 2032123113.

31132123020 is a `hidden beast` number, since 311 + 321 + 2 + 30 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 31132122984 and 31132123002.

It is not an unprimeable number, because it can be changed into a prime (31132123021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 266209 + ... + 364871.

It is an arithmetic number, because the mean of its divisors is an integer number (1312346308).

Almost surely, 2^31132123020 is an apocalyptic number.

31132123020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31132123020 is an abundant number, since it is smaller than the sum of its proper divisors (63356811156).

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

31132123020 is a wasteful number, since it uses less digits than its factorization.

31132123020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100431 (or 100426 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31132123020 its reverse (2032123113), we get a palindrome (33164246133).

The spelling of 31132123020 in words is "thirty-one billion, one hundred thirty-two million, one hundred twenty-three thousand, twenty".