22036981 has 4 divisors (see below), whose sum is σ = 23333292. Its totient is φ = 20740672.

The previous prime is 22036961. The next prime is 22036999. The reversal of 22036981 is 18963022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9821956 + 12215025 = 3134^2 + 3495^2 .

It is a cyclic number.

It is not a de Polignac number, because 22036981 - 2⁷ = 22036853 is a prime.

It is a super-2 number, since 2×22036981² = 971257063188722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22036961) 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 3 ways as a sum of consecutive naturals, for example, 648130 + ... + 648163.

It is an arithmetic number, because the mean of its divisors is an integer number (5833323).

Almost surely, 2^22036981 is an apocalyptic number.

It is an amenable number.

22036981 is a deficient number, since it is larger than the sum of its proper divisors (1296311).

22036981 is a wasteful number, since it uses less digits than its factorization.

22036981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296310.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 22036981 is about 4694.3562924005. The cubic root of 22036981 is about 280.3608485341.

The spelling of 22036981 in words is "twenty-two million, thirty-six thousand, nine hundred eighty-one".