22138420 has 96 divisors (see below), whose sum is σ = 54432000. Its totient is φ = 7501824.

The previous prime is 22138411. The next prime is 22138423. The reversal of 22138420 is 2483122.

It is a junction number, because it is equal to n+sod(n) for n = 22138391 and 22138400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22138423) 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, 148506 + ... + 148654.

It is an arithmetic number, because the mean of its divisors is an integer number (567000).

Almost surely, 2^22138420 is an apocalyptic number.

22138420 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 22138420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27216000).

22138420 is an abundant number, since it is smaller than the sum of its proper divisors (32293580).

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

22138420 is a wasteful number, since it uses less digits than its factorization.

22138420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 22138420 is about 4705.1482442108. The cubic root of 22138420 is about 280.7903689307.

The spelling of 22138420 in words is "twenty-two million, one hundred thirty-eight thousand, four hundred twenty".