22143420 has 72 divisors (see below), whose sum is σ = 72342816. Its totient is φ = 5450112.

The previous prime is 22143397. The next prime is 22143421. The reversal of 22143420 is 2434122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 22143393 and 22143402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22143421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2392 + ... + 7071.

Almost surely, 2^22143420 is an apocalyptic number.

22143420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22143420 is an abundant number, since it is smaller than the sum of its proper divisors (50199396).

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

22143420 is a wasteful number, since it uses less digits than its factorization.

22143420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9491 (or 9486 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 22143420 is about 4705.6795471005. The cubic root of 22143420 is about 280.8115063345.

Adding to 22143420 its reverse (2434122), we get a palindrome (24577542).

The spelling of 22143420 in words is "twenty-two million, one hundred forty-three thousand, four hundred twenty".