22403720 has 16 divisors (see below), whose sum is σ = 50408460. Its totient is φ = 8961472.

The previous prime is 22403713. The next prime is 22403723. The reversal of 22403720 is 2730422.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22335076 + 68644 = 4726^2 + 262^2 .

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 = 22403692 and 22403701.

It is not an unprimeable number, because it can be changed into a prime (22403723) 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, 280007 + ... + 280086.

Almost surely, 2^22403720 is an apocalyptic number.

22403720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22403720 is an abundant number, since it is smaller than the sum of its proper divisors (28004740).

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

22403720 is a wasteful number, since it uses less digits than its factorization.

22403720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560104 (or 560100 counting only the distinct ones).

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

The square root of 22403720 is about 4733.2568068931. The cubic root of 22403720 is about 281.9075531517.

The spelling of 22403720 in words is "twenty-two million, four hundred three thousand, seven hundred twenty".