202131312320020 has 72 divisors (see below), whose sum is σ = 433635615466200. Its totient is φ = 79123364436480.

The previous prime is 202131312320009. The next prime is 202131312320023. The reversal of 202131312320020 is 20023213131202.

It can be written as a sum of positive squares in 12 ways, for example, as 30854780965264 + 171276531354756 = 5554708^2 + 13087266^2 .

It is a junction number, because it is equal to n+sod(n) for n = 202131312319973 and 202131312320000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202131312320023) 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, 45212406 + ... + 49481554.

It is an arithmetic number, because the mean of its divisors is an integer number (6022716881475).

Almost surely, 2^{202131312320020} is an apocalyptic number.

202131312320020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202131312320020 is an abundant number, since it is smaller than the sum of its proper divisors (231504303146180).

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

202131312320020 is a wasteful number, since it uses less digits than its factorization.

202131312320020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4269613 (or 4269414 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 202131312320020 its reverse (20023213131202), we get a palindrome (222154525451222).

The spelling of 202131312320020 in words is "two hundred two trillion, one hundred thirty-one billion, three hundred twelve million, three hundred twenty thousand, twenty".