20620642605 has 32 divisors (see below), whose sum is σ = 33935695104. Its totient is φ = 10684348416.

The previous prime is 20620642577. The next prime is 20620642607. The reversal of 20620642605 is 50624602602.

It is not a de Polignac number, because 20620642605 - 2⁵ = 20620642573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20620642607) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 345912 + ... + 401118.

It is an arithmetic number, because the mean of its divisors is an integer number (1060490472).

Almost surely, 2^20620642605 is an apocalyptic number.

It is an amenable number.

20620642605 is a deficient number, since it is larger than the sum of its proper divisors (13315052499).

20620642605 is a wasteful number, since it uses less digits than its factorization.

20620642605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55925.

The product of its (nonzero) digits is 34560, while the sum is 33.

The spelling of 20620642605 in words is "twenty billion, six hundred twenty million, six hundred forty-two thousand, six hundred five".