22142420 has 24 divisors (see below), whose sum is σ = 47582304. Its totient is φ = 8650656.

The previous prime is 22142413. The next prime is 22142423. The reversal of 22142420 is 2424122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22142423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12014 + ... + 13733.

It is an arithmetic number, because the mean of its divisors is an integer number (1982596).

Almost surely, 2^22142420 is an apocalyptic number.

22142420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22142420 is an abundant number, since it is smaller than the sum of its proper divisors (25439884).

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

22142420 is a wasteful number, since it uses less digits than its factorization.

22142420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25799 (or 25797 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 22142420 is about 4705.5732913217. The cubic root of 22142420 is about 280.8072791083.

Adding to 22142420 its reverse (2424122), we get a palindrome (24566542).

The spelling of 22142420 in words is "twenty-two million, one hundred forty-two thousand, four hundred twenty".