20998368 has 36 divisors (see below), whose sum is σ = 59714928. Its totient is φ = 6999360.

The previous prime is 20998303. The next prime is 20998387. The reversal of 20998368 is 86389902.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36168 + ... + 36743.

It is an arithmetic number, because the mean of its divisors is an integer number (1658748).

Almost surely, 2^20998368 is an apocalyptic number.

It is an amenable number.

20998368 is an abundant number, since it is smaller than the sum of its proper divisors (38716560).

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

20998368 is a wasteful number, since it uses less digits than its factorization.

20998368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72927 (or 72916 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 20998368 is about 4582.3976256977. The cubic root of 20998368 is about 275.8852705256.

The spelling of 20998368 in words is "twenty million, nine hundred ninety-eight thousand, three hundred sixty-eight".