20464032515 has 4 divisors (see below), whose sum is σ = 24556839024. Its totient is φ = 16371226008.

The previous prime is 20464032503. The next prime is 20464032553. The reversal of 20464032515 is 51523046402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20464032515 - 2⁴ = 20464032499 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2046403247 + ... + 2046403256.

It is an arithmetic number, because the mean of its divisors is an integer number (6139209756).

Almost surely, 2^20464032515 is an apocalyptic number.

20464032515 is a deficient number, since it is larger than the sum of its proper divisors (4092806509).

20464032515 is an equidigital number, since it uses as much as digits as its factorization.

20464032515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092806508.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 20464032515 its reverse (51523046402), we get a palindrome (71987078917).

The spelling of 20464032515 in words is "twenty billion, four hundred sixty-four million, thirty-two thousand, five hundred fifteen".