20998386100 has 36 divisors (see below), whose sum is σ = 45605143584. Its totient is φ = 8392230880.

The previous prime is 20998386053. The next prime is 20998386127. The reversal of 20998386100 is 168389902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30249 + ... + 207151.

It is an arithmetic number, because the mean of its divisors is an integer number (1266809544).

Almost surely, 2^20998386100 is an apocalyptic number.

20998386100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20998386100 is an abundant number, since it is smaller than the sum of its proper divisors (24606757484).

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

20998386100 is a wasteful number, since it uses less digits than its factorization.

20998386100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178104 (or 178097 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 20998386100 in words is "twenty billion, nine hundred ninety-eight million, three hundred eighty-six thousand, one hundred".