31220202303020 has 24 divisors (see below), whose sum is σ = 65563340711568. Its totient is φ = 12487906468800.

The previous prime is 31220202302941. The next prime is 31220202303047. The reversal of 31220202303020 is 2030320202213.

It is a super-2 number, since 2×31220202303020² (a number of 28 digits) contains 22 as substring.

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 = 31220202302983 and 31220202303001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9430946 + ... + 12303785.

It is an arithmetic number, because the mean of its divisors is an integer number (2731805862982).

Almost surely, 2^{31220202303020} is an apocalyptic number.

It is an amenable number.

31220202303020 is an abundant number, since it is smaller than the sum of its proper divisors (34343138408548).

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

31220202303020 is a wasteful number, since it uses less digits than its factorization.

31220202303020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21806561 (or 21806559 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 31220202303020 its reverse (2030320202213), we get a palindrome (33250522505233).

The spelling of 31220202303020 in words is "thirty-one trillion, two hundred twenty billion, two hundred two million, three hundred three thousand, twenty".