20015431632617 has 4 divisors (see below), whose sum is σ = 20018097875856. Its totient is φ = 20012765389380.

The previous prime is 20015431632611. The next prime is 20015431632629. The reversal of 20015431632617 is 71623613451002.

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 20015431632617 - 2⁴ = 20015431632601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20015431632611) 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, 1333110359 + ... + 1333125372.

It is an arithmetic number, because the mean of its divisors is an integer number (5004524468964).

Almost surely, 2^{20015431632617} is an apocalyptic number.

It is an amenable number.

20015431632617 is a deficient number, since it is larger than the sum of its proper divisors (2666243239).

20015431632617 is an equidigital number, since it uses as much as digits as its factorization.

20015431632617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666243238.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 20015431632617 in words is "twenty trillion, fifteen billion, four hundred thirty-one million, six hundred thirty-two thousand, six hundred seventeen".