20402372265 has 64 divisors (see below), whose sum is σ = 37810851840. Its totient is φ = 9284336640.

The previous prime is 20402372261. The next prime is 20402372281. The reversal of 20402372265 is 56227320402.

It is not a de Polignac number, because 20402372265 - 2² = 20402372261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20402372261) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1019526 + ... + 1039344.

It is an arithmetic number, because the mean of its divisors is an integer number (590794560).

Almost surely, 2^20402372265 is an apocalyptic number.

It is an amenable number.

20402372265 is a deficient number, since it is larger than the sum of its proper divisors (17408479575).

20402372265 is a wasteful number, since it uses less digits than its factorization.

20402372265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20222.

The product of its (nonzero) digits is 40320, while the sum is 33.

Adding to 20402372265 its reverse (56227320402), we get a palindrome (76629692667).

The spelling of 20402372265 in words is "twenty billion, four hundred two million, three hundred seventy-two thousand, two hundred sixty-five".