20022720 has 56 divisors (see below), whose sum is σ = 63575184. Its totient is φ = 5339136.

The previous prime is 20022707. The next prime is 20022733. The reversal of 20022720 is 2722002.

It is an interprime number because it is at equal distance from previous prime (20022707) and next prime (20022733).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20022720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9469 + ... + 11388.

Almost surely, 2^20022720 is an apocalyptic number.

20022720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20022720 is an abundant number, since it is smaller than the sum of its proper divisors (43552464).

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

20022720 is a wasteful number, since it uses less digits than its factorization.

20022720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20877 (or 20867 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 15.

The square root of 20022720 is about 4474.6754072223. The cubic root of 20022720 is about 271.5445087095.

Adding to 20022720 its reverse (2722002), we get a palindrome (22744722).

The spelling of 20022720 in words is "twenty million, twenty-two thousand, seven hundred twenty".