22129720 has 32 divisors (see below), whose sum is σ = 50641200. Its totient is φ = 8700928.

The previous prime is 22129711. The next prime is 22129721. The reversal of 22129720 is 2792122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22129721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2329 + ... + 7048.

Almost surely, 2^22129720 is an apocalyptic number.

22129720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22129720 is an abundant number, since it is smaller than the sum of its proper divisors (28511480).

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

22129720 is a wasteful number, since it uses less digits than its factorization.

22129720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9447 (or 9443 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 22129720 is about 4704.2236341399. The cubic root of 22129720 is about 280.7535822603.

The spelling of 22129720 in words is "twenty-two million, one hundred twenty-nine thousand, seven hundred twenty".