20620640616 has 32 divisors (see below), whose sum is σ = 53792976960. Its totient is φ = 6574696832.

The previous prime is 20620640591. The next prime is 20620640627. The reversal of 20620640616 is 61604602602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18677565 + ... + 18678668.

It is an arithmetic number, because the mean of its divisors is an integer number (1681030530).

Almost surely, 2^20620640616 is an apocalyptic number.

It is an amenable number.

20620640616 is an abundant number, since it is smaller than the sum of its proper divisors (33172336344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20620640616 is a wasteful number, since it uses less digits than its factorization.

20620640616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37356265 (or 37356261 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The spelling of 20620640616 in words is "twenty billion, six hundred twenty million, six hundred forty thousand, six hundred sixteen".