20026606665 has 32 divisors (see below), whose sum is σ = 34514678016. Its totient is φ = 9857168640.

The previous prime is 20026606657. The next prime is 20026606681. The reversal of 20026606665 is 56660662002.

It is not a de Polignac number, because 20026606665 - 2³ = 20026606657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

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, 1351195 + ... + 1365935.

It is an arithmetic number, because the mean of its divisors is an integer number (1078583688).

Almost surely, 2^20026606665 is an apocalyptic number.

It is an amenable number.

20026606665 is a deficient number, since it is larger than the sum of its proper divisors (14488071351).

20026606665 is a wasteful number, since it uses less digits than its factorization.

20026606665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21729.

The product of its (nonzero) digits is 155520, while the sum is 39.

The spelling of 20026606665 in words is "twenty billion, twenty-six million, six hundred six thousand, six hundred sixty-five".