22420225 has 9 divisors (see below), whose sum is σ = 27830467. Its totient is φ = 17917240.

The previous prime is 22420213. The next prime is 22420241. The reversal of 22420225 is 52202422.

The square root of 22420225 is 4735.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 8071281 + 14348944 = 2841^2 + 3788^2 .

It is not a de Polignac number, because 22420225 - 2⁹ = 22419713 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 23202 + ... + 24148.

Almost surely, 2^22420225 is an apocalyptic number.

22420225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

22420225 is the 4735-th square number.

22420225 is the 2368-th centered octagonal number.

It is an amenable number.

22420225 is a deficient number, since it is larger than the sum of its proper divisors (5410242).

22420225 is an frugal number, since it uses more digits than its factorization.

22420225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904 (or 952 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The cubic root of 22420225 is about 281.9767640094.

Adding to 22420225 its reverse (52202422), we get a palindrome (74622647).

It can be divided in two parts, 224 and 20225, that added together give a square (20449 = 143²).

The spelling of 22420225 in words is "twenty-two million, four hundred twenty thousand, two hundred twenty-five".