20987159598 has 48 divisors (see below), whose sum is σ = 46237791600. Its totient is φ = 6878805120.

The previous prime is 20987159551. The next prime is 20987159693. The reversal of 20987159598 is 89595178902.

20987159598 is a `hidden beast` number, since 20 + 9 + 8 + 7 + 15 + 9 + 598 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 253773 + ... + 326151.

It is an arithmetic number, because the mean of its divisors is an integer number (963287325).

Almost surely, 2^20987159598 is an apocalyptic number.

20987159598 is an abundant number, since it is smaller than the sum of its proper divisors (25250632002).

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

20987159598 is a wasteful number, since it uses less digits than its factorization.

20987159598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72657 (or 72654 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 63.

The spelling of 20987159598 in words is "twenty billion, nine hundred eighty-seven million, one hundred fifty-nine thousand, five hundred ninety-eight".