31200033200020 has 12 divisors (see below), whose sum is σ = 65520069720084. Its totient is φ = 12480013280000.

The previous prime is 31200033200003. The next prime is 31200033200029. The reversal of 31200033200020 is 2000233000213.

It can be written as a sum of positive squares in 2 ways, for example, as 7039544529796 + 24160488670224 = 2653214^2 + 4915332^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31200033199967 and 31200033200003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31200033200029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780000829981 + ... + 780000830020.

It is an arithmetic number, because the mean of its divisors is an integer number (5460005810007).

Almost surely, 2^{31200033200020} is an apocalyptic number.

It is an amenable number.

31200033200020 is an abundant number, since it is smaller than the sum of its proper divisors (34320036520064).

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

31200033200020 is a wasteful number, since it uses less digits than its factorization.

31200033200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560001660010 (or 1560001660008 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 31200033200020 its reverse (2000233000213), we get a palindrome (33200266200233).

The spelling of 31200033200020 in words is "thirty-one trillion, two hundred billion, thirty-three million, two hundred thousand, twenty".