20889538518 has 16 divisors (see below), whose sum is σ = 41791780800. Its totient is φ = 6961062216.

The previous prime is 20889538493. The next prime is 20889538541. The reversal of 20889538518 is 81583598802.

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, 507880 + ... + 547467.

It is an arithmetic number, because the mean of its divisors is an integer number (2611986300).

Almost surely, 2^20889538518 is an apocalyptic number.

20889538518 is an abundant number, since it is smaller than the sum of its proper divisors (20902242282).

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

20889538518 is a wasteful number, since it uses less digits than its factorization.

20889538518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058651.

The product of its (nonzero) digits is 5529600, while the sum is 57.

The spelling of 20889538518 in words is "twenty billion, eight hundred eighty-nine million, five hundred thirty-eight thousand, five hundred eighteen".