20480864265 has 24 divisors (see below), whose sum is σ = 35652544200. Its totient is φ = 10876241664.

The previous prime is 20480864263. The next prime is 20480864269. The reversal of 20480864265 is 56246808402.

It can be written as a sum of positive squares in 4 ways, for example, as 943534089 + 19537330176 = 30717^2 + 139776^2 .

It is not a de Polignac number, because 20480864265 - 2¹ = 20480864263 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20480864265.

It is not an unprimeable number, because it can be changed into a prime (20480864263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 966190 + ... + 987159.

It is an arithmetic number, because the mean of its divisors is an integer number (1485522675).

Almost surely, 2^20480864265 is an apocalyptic number.

It is an amenable number.

20480864265 is a deficient number, since it is larger than the sum of its proper divisors (15171679935).

20480864265 is a wasteful number, since it uses less digits than its factorization.

20480864265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953593 (or 1953590 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 45.

The spelling of 20480864265 in words is "twenty billion, four hundred eighty million, eight hundred sixty-four thousand, two hundred sixty-five".