22131928 has 96 divisors (see below), whose sum is σ = 53721360. Its totient is φ = 8467200.

The previous prime is 22131913. The next prime is 22131931. The reversal of 22131928 is 82913122.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 22131896 and 22131905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 219078 + ... + 219178.

Almost surely, 2^22131928 is an apocalyptic number.

22131928 is a gapful number since it is divisible by the number (28) 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 22131928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26860680).

22131928 is an abundant number, since it is smaller than the sum of its proper divisors (31589432).

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

22131928 is a wasteful number, since it uses less digits than its factorization.

22131928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 166 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 22131928 is about 4704.4583110067. The cubic root of 22131928 is about 280.7629193764.

The spelling of 22131928 in words is "twenty-two million, one hundred thirty-one thousand, nine hundred twenty-eight".