20871798498 has 16 divisors (see below), whose sum is σ = 46381774560. Its totient is φ = 6957266148.

The previous prime is 20871798487. The next prime is 20871798529. The reversal of 20871798498 is 89489717802.

20871798498 is a `hidden beast` number, since 2 + 0 + 8 + 71 + 79 + 8 + 498 = 666.

It is a super-2 number, since 2×20871798498² (a number of 21 digits) contains 22 as substring.

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, 193257340 + ... + 193257447.

It is an arithmetic number, because the mean of its divisors is an integer number (2898860910).

Almost surely, 2^20871798498 is an apocalyptic number.

20871798498 is an abundant number, since it is smaller than the sum of its proper divisors (25509976062).

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

20871798498 is a wasteful number, since it uses less digits than its factorization.

20871798498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386514798 (or 386514792 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 63.

The spelling of 20871798498 in words is "twenty billion, eight hundred seventy-one million, seven hundred ninety-eight thousand, four hundred ninety-eight".