20615613455 has 16 divisors (see below), whose sum is σ = 25233997824. Its totient is φ = 16165447200.

The previous prime is 20615613433. The next prime is 20615613457. The reversal of 20615613455 is 55431651602.

It is not a de Polignac number, because 20615613455 - 2⁸ = 20615613199 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 (20615613457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142871 + ... + 248280.

It is an arithmetic number, because the mean of its divisors is an integer number (1577124864).

Almost surely, 2^20615613455 is an apocalyptic number.

20615613455 is a deficient number, since it is larger than the sum of its proper divisors (4618384369).

20615613455 is a wasteful number, since it uses less digits than its factorization.

20615613455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391366.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 20615613455 in words is "twenty billion, six hundred fifteen million, six hundred thirteen thousand, four hundred fifty-five".