20998104 has 32 divisors (see below), whose sum is σ = 53718720. Its totient is φ = 6836256.

The previous prime is 20998093. The next prime is 20998139. The reversal of 20998104 is 40189902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9142 + ... + 11205.

It is an arithmetic number, because the mean of its divisors is an integer number (1678710).

Almost surely, 2^20998104 is an apocalyptic number.

20998104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20998104 is an abundant number, since it is smaller than the sum of its proper divisors (32720616).

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

20998104 is a wasteful number, since it uses less digits than its factorization.

20998104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20399 (or 20395 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 20998104 is about 4582.3688197263. The cubic root of 20998104 is about 275.8841143402.

The spelling of 20998104 in words is "twenty million, nine hundred ninety-eight thousand, one hundred four".