20793990 has 64 divisors (see below), whose sum is σ = 57770496. Its totient is φ = 4691712.

The previous prime is 20793989. The next prime is 20794003. The reversal of 20793990 is 9939702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16834 + ... + 18026.

It is an arithmetic number, because the mean of its divisors is an integer number (902664).

Almost surely, 2^20793990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20793990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28885248).

20793990 is an abundant number, since it is smaller than the sum of its proper divisors (36976506).

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

20793990 is a wasteful number, since it uses less digits than its factorization.

20793990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293.

The product of its (nonzero) digits is 30618, while the sum is 39.

The square root of 20793990 is about 4560.0427629574. The cubic root of 20793990 is about 274.9872831585.

The spelling of 20793990 in words is "twenty million, seven hundred ninety-three thousand, nine hundred ninety".