22065381 has 24 divisors (see below), whose sum is σ = 34676096. Its totient is φ = 13439520.

The previous prime is 22065367. The next prime is 22065389. The reversal of 22065381 is 18356022.

22065381 is a `hidden beast` number, since 2 + 2 + 0 + 653 + 8 + 1 = 666.

It is not a de Polignac number, because 22065381 - 2²¹ = 19968229 is a prime.

It is a super-2 number, since 2×22065381² = 973762077350322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22065389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11136 + ... + 12966.

Almost surely, 2^22065381 is an apocalyptic number.

It is an amenable number.

22065381 is a deficient number, since it is larger than the sum of its proper divisors (12610715).

22065381 is a wasteful number, since it uses less digits than its factorization.

22065381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953 (or 1950 counting only the distinct ones).

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

The square root of 22065381 is about 4697.3802273182. The cubic root of 22065381 is about 280.4812345058.

The spelling of 22065381 in words is "twenty-two million, sixty-five thousand, three hundred eighty-one".