20722272 has 24 divisors (see below), whose sum is σ = 54396216. Its totient is φ = 6907392.

The previous prime is 20722237. The next prime is 20722277. The reversal of 20722272 is 27222702.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20722277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107833 + ... + 108024.

It is an arithmetic number, because the mean of its divisors is an integer number (2266509).

Almost surely, 2^20722272 is an apocalyptic number.

It is an amenable number.

20722272 is an abundant number, since it is smaller than the sum of its proper divisors (33673944).

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

20722272 is a wasteful number, since it uses less digits than its factorization.

20722272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215870 (or 215862 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 24.

The square root of 20722272 is about 4552.1722287277. The cubic root of 20722272 is about 274.6707773706.

Subtracting from 20722272 its product of nonzero digits (1568), we obtain a square (20720704 = 4552²).

Adding to 20722272 its reverse (27222702), we get a palindrome (47944974).

The spelling of 20722272 in words is "twenty million, seven hundred twenty-two thousand, two hundred seventy-two".