22170420 has 36 divisors (see below), whose sum is σ = 67250820. Its totient is φ = 5912064.

The previous prime is 22170373. The next prime is 22170427. The reversal of 22170420 is 2407122.

It can be written as a sum of positive squares in 2 ways, for example, as 12659364 + 9511056 = 3558^2 + 3084^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 22170393 and 22170402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22170427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61405 + ... + 61764.

Almost surely, 2^22170420 is an apocalyptic number.

22170420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22170420 is an abundant number, since it is smaller than the sum of its proper divisors (45080400).

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

22170420 is a wasteful number, since it uses less digits than its factorization.

22170420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123184 (or 123179 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 22170420 is about 4708.5475467494. The cubic root of 22170420 is about 280.9255933658.

Adding to 22170420 its reverse (2407122), we get a palindrome (24577542).

The spelling of 22170420 in words is "twenty-two million, one hundred seventy thousand, four hundred twenty".