20997441518 has 16 divisors (see below), whose sum is σ = 31594012416. Its totient is φ = 10466141280.

The previous prime is 20997441469. The next prime is 20997441529. The reversal of 20997441518 is 81514479902.

It is a happy number.

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, 1248755 + ... + 1265457.

It is an arithmetic number, because the mean of its divisors is an integer number (1974625776).

Almost surely, 2^20997441518 is an apocalyptic number.

20997441518 is a deficient number, since it is larger than the sum of its proper divisors (10596570898).

20997441518 is a wasteful number, since it uses less digits than its factorization.

20997441518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18619.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 20997441518 in words is "twenty billion, nine hundred ninety-seven million, four hundred forty-one thousand, five hundred eighteen".