22072720 has 40 divisors (see below), whose sum is σ = 52713144. Its totient is φ = 8589312.

The previous prime is 22072703. The next prime is 22072723. The reversal of 22072720 is 2727022.

It can be written as a sum of positive squares in 4 ways, for example, as 4129024 + 17943696 = 2032^2 + 4236^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 22072691 and 22072700.

It is not an unprimeable number, because it can be changed into a prime (22072723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 769 + ... + 6688.

Almost surely, 2^22072720 is an apocalyptic number.

22072720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22072720 is an abundant number, since it is smaller than the sum of its proper divisors (30640424).

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

22072720 is a wasteful number, since it uses less digits than its factorization.

22072720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7507 (or 7501 counting only the distinct ones).

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

The square root of 22072720 is about 4698.1613424828. The cubic root of 22072720 is about 280.5123273084.

Adding to 22072720 its reverse (2727022), we get a palindrome (24799742).

The spelling of 22072720 in words is "twenty-two million, seventy-two thousand, seven hundred twenty".