20759816 has 64 divisors (see below), whose sum is σ = 49351680. Its totient is φ = 7951680.

The previous prime is 20759807. The next prime is 20759821. The reversal of 20759816 is 61895702.

It is a self number, because there is not a number n which added to its sum of digits gives 20759816.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41021 + ... + 41523.

It is an arithmetic number, because the mean of its divisors is an integer number (771120).

Almost surely, 2^20759816 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 20759816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24675840).

20759816 is an abundant number, since it is smaller than the sum of its proper divisors (28591864).

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

20759816 is a wasteful number, since it uses less digits than its factorization.

20759816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594 (or 590 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 20759816 is about 4556.2941081541. The cubic root of 20759816 is about 274.8365574248.

The spelling of 20759816 in words is "twenty million, seven hundred fifty-nine thousand, eight hundred sixteen".