22072320 has 132 divisors (see below), whose sum is σ = 76639680. Its totient is φ = 5873664.

The previous prime is 22072289. The next prime is 22072331. The reversal of 22072320 is 2327022.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 22072293 and 22072302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45841 + ... + 46319.

Almost surely, 2^22072320 is an apocalyptic number.

22072320 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 22072320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38319840).

22072320 is an abundant number, since it is smaller than the sum of its proper divisors (54567360).

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

22072320 is a wasteful number, since it uses less digits than its factorization.

22072320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 22072320 is about 4698.1187724450. The cubic root of 22072320 is about 280.5106328245.

Adding to 22072320 its reverse (2327022), we get a palindrome (24399342).

The spelling of 22072320 in words is "twenty-two million, seventy-two thousand, three hundred twenty".