20400260665 has 32 divisors (see below), whose sum is σ = 25938372096. Its totient is φ = 15370629120.

The previous prime is 20400260633. The next prime is 20400260707. The reversal of 20400260665 is 56606200402.

It is not a de Polignac number, because 20400260665 - 2⁵ = 20400260633 is a prime.

It is a Duffinian 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, 9935779 + ... + 9937831.

It is an arithmetic number, because the mean of its divisors is an integer number (810574128).

Almost surely, 2^20400260665 is an apocalyptic number.

It is an amenable number.

20400260665 is a deficient number, since it is larger than the sum of its proper divisors (5538111431).

20400260665 is a wasteful number, since it uses less digits than its factorization.

20400260665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3369.

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 20400260665 in words is "twenty billion, four hundred million, two hundred sixty thousand, six hundred sixty-five".