20785872 has 80 divisors (see below), whose sum is σ = 56583680. Its totient is φ = 6566400.

The previous prime is 20785871. The next prime is 20785873. The reversal of 20785872 is 27858702.

It is an interprime number because it is at equal distance from previous prime (20785871) and next prime (20785873).

It is a self number, because there is not a number n which added to its sum of digits gives 20785872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20785871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90654 + ... + 90882.

It is an arithmetic number, because the mean of its divisors is an integer number (707296).

Almost surely, 2^20785872 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 20785872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28291840).

20785872 is an abundant number, since it is smaller than the sum of its proper divisors (35797808).

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

20785872 is a wasteful number, since it uses less digits than its factorization.

20785872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 20785872 is about 4559.1525528326. The cubic root of 20785872 is about 274.9514933729.

The spelling of 20785872 in words is "twenty million, seven hundred eighty-five thousand, eight hundred seventy-two".