22640247 has 24 divisors (see below), whose sum is σ = 38014080. Its totient is φ = 12715920.

The previous prime is 22640221. The next prime is 22640249. The reversal of 22640247 is 74204622.

It is a happy number.

It is not a de Polignac number, because 22640247 - 2⁶ = 22640183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22640247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22640249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 672 + ... + 6762.

It is an arithmetic number, because the mean of its divisors is an integer number (1583920).

Almost surely, 2^22640247 is an apocalyptic number.

22640247 is a deficient number, since it is larger than the sum of its proper divisors (15373833).

22640247 is a wasteful number, since it uses less digits than its factorization.

22640247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6163 (or 6160 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 22640247 is about 4758.1768567383. The cubic root of 22640247 is about 282.8961607158.

Adding to 22640247 its reverse (74204622), we get a palindrome (96844869).

The spelling of 22640247 in words is "twenty-two million, six hundred forty thousand, two hundred forty-seven".