22129820 has 12 divisors (see below), whose sum is σ = 46472664. Its totient is φ = 8851920.

The previous prime is 22129817. The next prime is 22129829. The reversal of 22129820 is 2892122.

It is a self number, because there is not a number n which added to its sum of digits gives 22129820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22129829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553226 + ... + 553265.

It is an arithmetic number, because the mean of its divisors is an integer number (3872722).

Almost surely, 2^22129820 is an apocalyptic number.

22129820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22129820 is an abundant number, since it is smaller than the sum of its proper divisors (24342844).

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

22129820 is a wasteful number, since it uses less digits than its factorization.

22129820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106500 (or 1106498 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 22129820 is about 4704.2342628742. The cubic root of 22129820 is about 280.7540051504.

The spelling of 22129820 in words is "twenty-two million, one hundred twenty-nine thousand, eight hundred twenty".