20620406665 has 8 divisors (see below), whose sum is σ = 24747675840. Its totient is φ = 16494200112.

The previous prime is 20620406623. The next prime is 20620406671. The reversal of 20620406665 is 56660402602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20620406665 - 2¹³ = 20620398473 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222319 + ... + 301108.

It is an arithmetic number, because the mean of its divisors is an integer number (3093459480).

Almost surely, 2^20620406665 is an apocalyptic number.

It is an amenable number.

20620406665 is a deficient number, since it is larger than the sum of its proper divisors (4127269175).

20620406665 is an equidigital number, since it uses as much as digits as its factorization.

20620406665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531311.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 20620406665 in words is "twenty billion, six hundred twenty million, four hundred six thousand, six hundred sixty-five".