31012432020 has 36 divisors (see below), whose sum is σ = 94071044340. Its totient is φ = 8269981824.

The previous prime is 31012432001. The next prime is 31012432079. The reversal of 31012432020 is 2023421013.

31012432020 is a `hidden beast` number, since 310 + 12 + 4 + 320 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7526256516 + 23486175504 = 86754^2 + 153252^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 31012431984 and 31012432002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86145465 + ... + 86145824.

It is an arithmetic number, because the mean of its divisors is an integer number (2613084565).

Almost surely, 2^31012432020 is an apocalyptic number.

31012432020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31012432020 is an abundant number, since it is smaller than the sum of its proper divisors (63058612320).

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

31012432020 is a wasteful number, since it uses less digits than its factorization.

31012432020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172291304 (or 172291299 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 31012432020 its reverse (2023421013), we get a palindrome (33035853033).

The spelling of 31012432020 in words is "thirty-one billion, twelve million, four hundred thirty-two thousand, twenty".