20305902331 has 16 divisors (see below), whose sum is σ = 25259175648. Its totient is φ = 16037568000.

The previous prime is 20305902289. The next prime is 20305902343. The reversal of 20305902331 is 13320950302.

It is a cyclic number.

It is not a de Polignac number, because 20305902331 - 2⁷ = 20305902203 is a prime.

It is a super-2 number, since 2×20305902331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20305902331.

It is not an unprimeable number, because it can be changed into a prime (20305902391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4174020 + ... + 4178881.

It is an arithmetic number, because the mean of its divisors is an integer number (1578698478).

Almost surely, 2^20305902331 is an apocalyptic number.

20305902331 is a deficient number, since it is larger than the sum of its proper divisors (4953273317).

20305902331 is a wasteful number, since it uses less digits than its factorization.

20305902331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8352942.

The product of its (nonzero) digits is 4860, while the sum is 28.

The spelling of 20305902331 in words is "twenty billion, three hundred five million, nine hundred two thousand, three hundred thirty-one".