22081564 has 12 divisors (see below), whose sum is σ = 40323024. Its totient is φ = 10560704.

The previous prime is 22081561. The next prime is 22081567. The reversal of 22081564 is 46518022.

It is an interprime number because it is at equal distance from previous prime (22081561) and next prime (22081567).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22081561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119917 + ... + 120100.

It is an arithmetic number, because the mean of its divisors is an integer number (3360252).

Almost surely, 2^22081564 is an apocalyptic number.

It is an amenable number.

22081564 is a deficient number, since it is larger than the sum of its proper divisors (18241460).

22081564 is a wasteful number, since it uses less digits than its factorization.

22081564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240044 (or 240042 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 22081564 is about 4699.1024674931. The cubic root of 22081564 is about 280.5497871194.

Adding to 22081564 its reverse (46518022), we get a palindrome (68599586).

The spelling of 22081564 in words is "twenty-two million, eighty-one thousand, five hundred sixty-four".