20512500401 has 4 divisors (see below), whose sum is σ = 20514687600. Its totient is φ = 20510313204.

The previous prime is 20512500353. The next prime is 20512500403. The reversal of 20512500401 is 10400521502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20512500401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20512500403) 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, 1079471 + ... + 1098308.

It is an arithmetic number, because the mean of its divisors is an integer number (5128671900).

Almost surely, 2^20512500401 is an apocalyptic number.

It is an amenable number.

20512500401 is a deficient number, since it is larger than the sum of its proper divisors (2187199).

20512500401 is an equidigital number, since it uses as much as digits as its factorization.

20512500401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2187198.

The product of its (nonzero) digits is 400, while the sum is 20.

The spelling of 20512500401 in words is "twenty billion, five hundred twelve million, five hundred thousand, four hundred one".