22043720 has 16 divisors (see below), whose sum is σ = 49598460. Its totient is φ = 8817472.

The previous prime is 22043717. The next prime is 22043731. The reversal of 22043720 is 2734022.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20232004 + 1811716 = 4498^2 + 1346^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 22043692 and 22043701.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275507 + ... + 275586.

Almost surely, 2^22043720 is an apocalyptic number.

22043720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22043720 is an abundant number, since it is smaller than the sum of its proper divisors (27554740).

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

22043720 is a wasteful number, since it uses less digits than its factorization.

22043720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551104 (or 551100 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 22043720 is about 4695.0740143261. The cubic root of 22043720 is about 280.3894241241.

Adding to 22043720 its reverse (2734022), we get a palindrome (24777742).

The spelling of 22043720 in words is "twenty-two million, forty-three thousand, seven hundred twenty".