20722072 has 64 divisors (see below), whose sum is σ = 46566720. Its totient is φ = 8460288.

The previous prime is 20722007. The next prime is 20722073. The reversal of 20722072 is 27022702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20722073) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 151188 + ... + 151324.

It is an arithmetic number, because the mean of its divisors is an integer number (727605).

Almost surely, 2^20722072 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 20722072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23283360).

20722072 is an abundant number, since it is smaller than the sum of its proper divisors (25844648).

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

20722072 is a wasteful number, since it uses less digits than its factorization.

20722072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 22.

The square root of 20722072 is about 4552.1502611403. The cubic root of 20722072 is about 274.6698937106.

Adding to 20722072 its reverse (27022702), we get a palindrome (47744774).

It can be divided in two parts, 2072207 and 2, that multiplied together give a palindrome (4144414).

The spelling of 20722072 in words is "twenty million, seven hundred twenty-two thousand, seventy-two".