20693790 has 96 divisors (see below), whose sum is σ = 60540480. Its totient is φ = 4866048.

The previous prime is 20693749. The next prime is 20693819. The reversal of 20693790 is 9739602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26526 + ... + 27294.

It is an arithmetic number, because the mean of its divisors is an integer number (630630).

Almost surely, 2^20693790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20693790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30270240).

20693790 is an abundant number, since it is smaller than the sum of its proper divisors (39846690).

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

20693790 is a wasteful number, since it uses less digits than its factorization.

20693790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818 (or 815 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 20693790 is about 4549.0427564489. The cubic root of 20693790 is about 274.5448780477.

The spelling of 20693790 in words is "twenty million, six hundred ninety-three thousand, seven hundred ninety".