31231132200020 has 24 divisors (see below), whose sum is σ = 67701034963968. Its totient is φ = 12089470528800.

The previous prime is 31231132199963. The next prime is 31231132200029. The reversal of 31231132200020 is 2000223113213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31231132199965 and 31231132200001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231132200029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25186396316 + ... + 25186397555.

It is an arithmetic number, because the mean of its divisors is an integer number (2820876456832).

Almost surely, 2^{31231132200020} is an apocalyptic number.

It is an amenable number.

31231132200020 is an abundant number, since it is smaller than the sum of its proper divisors (36469902763948).

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

31231132200020 is a wasteful number, since it uses less digits than its factorization.

31231132200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50372793911 (or 50372793909 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31231132200020 its reverse (2000223113213), we get a palindrome (33231355313233).

The spelling of 31231132200020 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred thirty-two million, two hundred thousand, twenty".