22505247 has 36 divisors (see below), whose sum is σ = 35369880. Its totient is φ = 13771296.

The previous prime is 22505239. The next prime is 22505251. The reversal of 22505247 is 74250522.

It is not a de Polignac number, because 22505247 - 2³ = 22505239 is a prime.

It is a super-2 number, since 2×22505247² = 1012972285062018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22505247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22505207) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 137988 + ... + 138150.

Almost surely, 2^22505247 is an apocalyptic number.

22505247 is a deficient number, since it is larger than the sum of its proper divisors (12864633).

22505247 is a wasteful number, since it uses less digits than its factorization.

22505247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 22505247 is about 4743.9695403744. The cubic root of 22505247 is about 282.3327519189.

Adding to 22505247 its reverse (74250522), we get a palindrome (96755769).

The spelling of 22505247 in words is "twenty-two million, five hundred five thousand, two hundred forty-seven".