20668020015 has 16 divisors (see below), whose sum is σ = 33080630400. Its totient is φ = 11019011232.

The previous prime is 20668020007. The next prime is 20668020017. The reversal of 20668020015 is 51002086602.

It is not a de Polignac number, because 20668020015 - 2³ = 20668020007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20668020017) 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, 202105 + ... + 286674.

It is an arithmetic number, because the mean of its divisors is an integer number (2067539400).

Almost surely, 2^20668020015 is an apocalyptic number.

20668020015 is a deficient number, since it is larger than the sum of its proper divisors (12412610385).

20668020015 is a wasteful number, since it uses less digits than its factorization.

20668020015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491606.

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 20668020015 in words is "twenty billion, six hundred sixty-eight million, twenty thousand, fifteen".