22403820 has 48 divisors (see below), whose sum is σ = 63368928. Its totient is φ = 5913600.

The previous prime is 22403809. The next prime is 22403873. The reversal of 22403820 is 2830422.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4212 + ... + 7908.

It is an arithmetic number, because the mean of its divisors is an integer number (1320186).

Almost surely, 2^22403820 is an apocalyptic number.

22403820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22403820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31684464).

22403820 is an abundant number, since it is smaller than the sum of its proper divisors (40965108).

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

22403820 is a wasteful number, since it uses less digits than its factorization.

22403820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3810 (or 3808 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 22403820 is about 4733.2673704324. The cubic root of 22403820 is about 281.9079725868.

The spelling of 22403820 in words is "twenty-two million, four hundred three thousand, eight hundred twenty".