20680217518 has 16 divisors (see below), whose sum is σ = 31134597120. Its totient is φ = 10302077016.

The previous prime is 20680217497. The next prime is 20680217531. The reversal of 20680217518 is 81571208602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 726763 + ... + 754681.

It is an arithmetic number, because the mean of its divisors is an integer number (1945912320).

Almost surely, 2^20680217518 is an apocalyptic number.

20680217518 is a deficient number, since it is larger than the sum of its proper divisors (10454379602).

20680217518 is a wasteful number, since it uses less digits than its factorization.

20680217518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29271.

The product of its (nonzero) digits is 53760, while the sum is 40.

The spelling of 20680217518 in words is "twenty billion, six hundred eighty million, two hundred seventeen thousand, five hundred eighteen".