22660781 has 16 divisors (see below), whose sum is σ = 26889408. Its totient is φ = 18825600.

The previous prime is 22660747. The next prime is 22660801. The reversal of 22660781 is 18706622.

It is a cyclic number.

It is not a de Polignac number, because 22660781 - 2¹⁸ = 22398637 is a prime.

It is a super-2 number, since 2×22660781² = 1027021991059922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22660181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14561 + ... + 16041.

It is an arithmetic number, because the mean of its divisors is an integer number (1680588).

Almost surely, 2^22660781 is an apocalyptic number.

It is an amenable number.

22660781 is a deficient number, since it is larger than the sum of its proper divisors (4228627).

22660781 is a wasteful number, since it uses less digits than its factorization.

22660781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 22660781 is about 4760.3341269285. The cubic root of 22660781 is about 282.9816608792.

The spelling of 22660781 in words is "twenty-two million, six hundred sixty thousand, seven hundred eighty-one".