20315455131331 has 4 divisors (see below), whose sum is σ = 20970792393664. Its totient is φ = 19660117869000.

The previous prime is 20315455131311. The next prime is 20315455131347. The reversal of 20315455131331 is 13313155451302.

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 20315455131331 - 2²⁵ = 20315421576899 is a prime.

It is a super-2 number, since 2×20315455131331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20315455131311) 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, 327668631120 + ... + 327668631181.

It is an arithmetic number, because the mean of its divisors is an integer number (5242698098416).

Almost surely, 2^{20315455131331} is an apocalyptic number.

20315455131331 is a deficient number, since it is larger than the sum of its proper divisors (655337262333).

20315455131331 is an equidigital number, since it uses as much as digits as its factorization.

20315455131331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655337262332.

The product of its (nonzero) digits is 81000, while the sum is 37.

The spelling of 20315455131331 in words is "twenty trillion, three hundred fifteen billion, four hundred fifty-five million, one hundred thirty-one thousand, three hundred thirty-one".