20511240501 has 4 divisors (see below), whose sum is σ = 27348320672. Its totient is φ = 13674160332.

The previous prime is 20511240467. The next prime is 20511240509. The reversal of 20511240501 is 10504211502.

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 not a de Polignac number, because 20511240501 - 2²³ = 20502851893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20511240509) 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, 3418540081 + ... + 3418540086.

It is an arithmetic number, because the mean of its divisors is an integer number (6837080168).

Almost surely, 2^20511240501 is an apocalyptic number.

It is an amenable number.

20511240501 is a deficient number, since it is larger than the sum of its proper divisors (6837080171).

20511240501 is an equidigital number, since it uses as much as digits as its factorization.

20511240501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6837080170.

The product of its (nonzero) digits is 400, while the sum is 21.

The spelling of 20511240501 in words is "twenty billion, five hundred eleven million, two hundred forty thousand, five hundred one".