20315655751 has 4 divisors (see below), whose sum is σ = 20317730400. Its totient is φ = 20313581104.

The previous prime is 20315655743. The next prime is 20315655761. The reversal of 20315655751 is 15755651302.

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 20315655751 - 2³ = 20315655743 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 (20315655761) 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, 1022566 + ... + 1042243.

It is an arithmetic number, because the mean of its divisors is an integer number (5079432600).

Almost surely, 2^20315655751 is an apocalyptic number.

20315655751 is a deficient number, since it is larger than the sum of its proper divisors (2074649).

20315655751 is an equidigital number, since it uses as much as digits as its factorization.

20315655751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2074648.

The product of its (nonzero) digits is 157500, while the sum is 40.

The spelling of 20315655751 in words is "twenty billion, three hundred fifteen million, six hundred fifty-five thousand, seven hundred fifty-one".