20862720 has 108 divisors (see below), whose sum is σ = 72222696. Its totient is φ = 5560320.

The previous prime is 20862713. The next prime is 20862731. The reversal of 20862720 is 2726802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10615 + ... + 12425.

Almost surely, 2^20862720 is an apocalyptic number.

20862720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20862720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36111348).

20862720 is an abundant number, since it is smaller than the sum of its proper divisors (51359976).

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

20862720 is a wasteful number, since it uses less digits than its factorization.

20862720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1838 (or 1821 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20862720 is about 4567.5726595206. The cubic root of 20862720 is about 275.2899201381.

The spelling of 20862720 in words is "twenty million, eight hundred sixty-two thousand, seven hundred twenty".