20315100644556 has 96 divisors (see below), whose sum is σ = 51586222645440. Its totient is φ = 6198446284800.

The previous prime is 20315100644521. The next prime is 20315100644561. The reversal of 20315100644556 is 65544600151302.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8063955 + ... + 10278986.

It is an arithmetic number, because the mean of its divisors is an integer number (537356485890).

Almost surely, 2^{20315100644556} is an apocalyptic number.

It is an amenable number.

20315100644556 is an abundant number, since it is smaller than the sum of its proper divisors (31271122000884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20315100644556 is a wasteful number, since it uses less digits than its factorization.

20315100644556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18343115 (or 18343113 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

Adding to 20315100644556 its reverse (65544600151302), we get a palindrome (85859700795858).

The spelling of 20315100644556 in words is "twenty trillion, three hundred fifteen billion, one hundred million, six hundred forty-four thousand, five hundred fifty-six".