22013865 has 12 divisors (see below), whose sum is σ = 38157444. Its totient is φ = 11740704.

The previous prime is 22013857. The next prime is 22013867. The reversal of 22013865 is 56831022.

It can be written as a sum of positive squares in 2 ways, for example, as 3143529 + 18870336 = 1773^2 + 4344^2 .

It is not a de Polignac number, because 22013865 - 2³ = 22013857 is a prime.

It is a super-2 number, since 2×22013865² = 969220504476450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22013867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 244554 + ... + 244643.

It is an arithmetic number, because the mean of its divisors is an integer number (3179787).

Almost surely, 2^22013865 is an apocalyptic number.

It is an amenable number.

22013865 is a deficient number, since it is larger than the sum of its proper divisors (16143579).

22013865 is a wasteful number, since it uses less digits than its factorization.

22013865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489208 (or 489205 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 22013865 is about 4691.8935409917. The cubic root of 22013865 is about 280.2627847575.

Adding to 22013865 its reverse (56831022), we get a palindrome (78844887).

The spelling of 22013865 in words is "twenty-two million, thirteen thousand, eight hundred sixty-five".