22163840 has 32 divisors (see below), whose sum is σ = 52986960. Its totient is φ = 8865280.

The previous prime is 22163839. The next prime is 22163887. The reversal of 22163840 is 4836122.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-3 number, since 3×22163840³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

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, 16676 + ... + 17955.

Almost surely, 2^22163840 is an apocalyptic number.

22163840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22163840 is an abundant number, since it is smaller than the sum of its proper divisors (30823120).

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

22163840 is an equidigital number, since it uses as much as digits as its factorization.

22163840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34650 (or 34638 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 22163840 is about 4707.8487656253. The cubic root of 22163840 is about 280.8977984735.

Adding to 22163840 its reverse (4836122), we get a palindrome (26999962).

The spelling of 22163840 in words is "twenty-two million, one hundred sixty-three thousand, eight hundred forty".