20993104 has 40 divisors (see below), whose sum is σ = 44684640. Its totient is φ = 9475200.

The previous prime is 20993087. The next prime is 20993111. The reversal of 20993104 is 40139902.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31527 + ... + 32185.

It is an arithmetic number, because the mean of its divisors is an integer number (1117116).

Almost surely, 2^20993104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20993104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22342320).

20993104 is an abundant number, since it is smaller than the sum of its proper divisors (23691536).

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

20993104 is a wasteful number, since it uses less digits than its factorization.

20993104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859 (or 853 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20993104 is about 4581.8232178905. The cubic root of 20993104 is about 275.8622150603.

The spelling of 20993104 in words is "twenty million, nine hundred ninety-three thousand, one hundred four".