20518418716 has 24 divisors (see below), whose sum is σ = 36109172736. Its totient is φ = 10201554480.

The previous prime is 20518418699. The next prime is 20518418729. The reversal of 20518418716 is 61781481502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3792085 + ... + 3797491.

It is an arithmetic number, because the mean of its divisors is an integer number (1504548864).

Almost surely, 2^20518418716 is an apocalyptic number.

It is an amenable number.

20518418716 is a deficient number, since it is larger than the sum of its proper divisors (15590754020).

20518418716 is a wasteful number, since it uses less digits than its factorization.

20518418716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10569 (or 10567 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 43.

The spelling of 20518418716 in words is "twenty billion, five hundred eighteen million, four hundred eighteen thousand, seven hundred sixteen".