22012440 has 32 divisors (see below), whose sum is σ = 66037680. Its totient is φ = 5869952.

The previous prime is 22012429. The next prime is 22012451. The reversal of 22012440 is 4421022.

It is an interprime number because it is at equal distance from previous prime (22012429) and next prime (22012451).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91599 + ... + 91838.

Almost surely, 2^22012440 is an apocalyptic number.

22012440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22012440 is an abundant number, since it is smaller than the sum of its proper divisors (44025240).

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

22012440 is a wasteful number, since it uses less digits than its factorization.

22012440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183451 (or 183447 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 22012440 is about 4691.7416808686. The cubic root of 22012440 is about 280.2567373099.

Adding to 22012440 its reverse (4421022), we get a palindrome (26433462).

The spelling of 22012440 in words is "twenty-two million, twelve thousand, four hundred forty".