20311136501 has 4 divisors (see below), whose sum is σ = 20314562400. Its totient is φ = 20307710604.

The previous prime is 20311136491. The next prime is 20311136537. The reversal of 20311136501 is 10563111302.

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 not a de Polignac number, because 20311136501 - 2²² = 20306942197 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 (20311136101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1704041 + ... + 1715918.

It is an arithmetic number, because the mean of its divisors is an integer number (5078640600).

Almost surely, 2^20311136501 is an apocalyptic number.

It is an amenable number.

20311136501 is a deficient number, since it is larger than the sum of its proper divisors (3425899).

20311136501 is an equidigital number, since it uses as much as digits as its factorization.

20311136501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3425898.

The product of its (nonzero) digits is 540, while the sum is 23.

Adding to 20311136501 its reverse (10563111302), we get a palindrome (30874247803).

The spelling of 20311136501 in words is "twenty billion, three hundred eleven million, one hundred thirty-six thousand, five hundred one".