31020220305 has 12 divisors (see below), whose sum is σ = 53768381940. Its totient is φ = 16544117472.

The previous prime is 31020220303. The next prime is 31020220349. The reversal of 31020220305 is 50302202013.

It can be written as a sum of positive squares in 2 ways, for example, as 15976707201 + 15043513104 = 126399^2 + 122652^2 .

It is not a de Polignac number, because 31020220305 - 2¹ = 31020220303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31020220303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 344669070 + ... + 344669159.

It is an arithmetic number, because the mean of its divisors is an integer number (4480698495).

Almost surely, 2^31020220305 is an apocalyptic number.

It is an amenable number.

31020220305 is a deficient number, since it is larger than the sum of its proper divisors (22748161635).

31020220305 is a wasteful number, since it uses less digits than its factorization.

31020220305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689338240 (or 689338237 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

Adding to 31020220305 its reverse (50302202013), we get a palindrome (81322422318).

The spelling of 31020220305 in words is "thirty-one billion, twenty million, two hundred twenty thousand, three hundred five".