20501233513 has 4 divisors (see below), whose sum is σ = 20507447428. Its totient is φ = 20495019600.

The previous prime is 20501233507. The next prime is 20501233547. The reversal of 20501233513 is 31533210502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3770328409 + 16730905104 = 61403^2 + 129348^2 .

It is a cyclic number.

It is not a de Polignac number, because 20501233513 - 2²⁵ = 20467679081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20501233553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3102006 + ... + 3108607.

It is an arithmetic number, because the mean of its divisors is an integer number (5126861857).

Almost surely, 2^20501233513 is an apocalyptic number.

It is an amenable number.

20501233513 is a deficient number, since it is larger than the sum of its proper divisors (6213915).

20501233513 is an equidigital number, since it uses as much as digits as its factorization.

20501233513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6213914.

The product of its (nonzero) digits is 2700, while the sum is 25.

The spelling of 20501233513 in words is "twenty billion, five hundred one million, two hundred thirty-three thousand, five hundred thirteen".