20312103220020 has 84 divisors (see below), whose sum is σ = 63953869073220. Its totient is φ = 5416560854784.

The previous prime is 20312103219983. The next prime is 20312103220037. The reversal of 20312103220020 is 2002230121302.

20312103220020 is a `hidden beast` number, since 2 + 0 + 312 + 10 + 322 + 0 + 0 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2364035401764 + 17948067818256 = 1537542^2 + 4236516^2 .

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 = 20312103219975 and 20312103220002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 696559605 + ... + 696588764.

It is an arithmetic number, because the mean of its divisors is an integer number (761355584205).

Almost surely, 2^{20312103220020} is an apocalyptic number.

20312103220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312103220020 is an abundant number, since it is smaller than the sum of its proper divisors (43641765853200).

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

20312103220020 is a wasteful number, since it uses less digits than its factorization.

20312103220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393148396 (or 1393148379 counting only the distinct ones).

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

Adding to 20312103220020 its reverse (2002230121302), we get a palindrome (22314333341322).

The spelling of 20312103220020 in words is "twenty trillion, three hundred twelve billion, one hundred three million, two hundred twenty thousand, twenty".