22156420 has 96 divisors (see below), whose sum is σ = 55996416. Its totient is φ = 7257600.

The previous prime is 22156397. The next prime is 22156439. The reversal of 22156420 is 2465122.

It is a super-3 number, since 3×22156420³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 22156391 and 22156400.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174397 + ... + 174523.

It is an arithmetic number, because the mean of its divisors is an integer number (583296).

Almost surely, 2^22156420 is an apocalyptic number.

22156420 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 22156420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27998208).

22156420 is an abundant number, since it is smaller than the sum of its proper divisors (33839996).

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

22156420 is a wasteful number, since it uses less digits than its factorization.

22156420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 22156420 is about 4707.0606539538. The cubic root of 22156420 is about 280.8664486969.

The spelling of 22156420 in words is "twenty-two million, one hundred fifty-six thousand, four hundred twenty".