22423720 has 96 divisors (see below), whose sum is σ = 57312360. Its totient is φ = 7884800.

The previous prime is 22423711. The next prime is 22423729. The reversal of 22423720 is 2732422.

It is an interprime number because it is at equal distance from previous prime (22423711) and next prime (22423729).

It can be written as a sum of positive squares in 4 ways, for example, as 5134756 + 17288964 = 2266^2 + 4158^2 .

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 22423691 and 22423700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22423729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 198384 + ... + 198496.

Almost surely, 2^22423720 is an apocalyptic number.

22423720 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 22423720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28656180).

22423720 is an abundant number, since it is smaller than the sum of its proper divisors (34888640).

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

22423720 is a wasteful number, since it uses less digits than its factorization.

22423720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 22.

The square root of 22423720 is about 4735.3690458084. The cubic root of 22423720 is about 281.9914153281.

The spelling of 22423720 in words is "twenty-two million, four hundred twenty-three thousand, seven hundred twenty".