22639920 has 160 divisors (see below), whose sum is σ = 77137920. Its totient is φ = 5468160.

The previous prime is 22639891. The next prime is 22639921. The reversal of 22639920 is 2993622.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (22639921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126391 + ... + 126569.

It is an arithmetic number, because the mean of its divisors is an integer number (482112).

Almost surely, 2^22639920 is an apocalyptic number.

22639920 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 22639920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38568960).

22639920 is an abundant number, since it is smaller than the sum of its proper divisors (54498000).

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

22639920 is a wasteful number, since it uses less digits than its factorization.

22639920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 22639920 is about 4758.1424947137. The cubic root of 22639920 is about 282.8947987240.

The spelling of 22639920 in words is "twenty-two million, six hundred thirty-nine thousand, nine hundred twenty".