22709881 has 4 divisors (see below), whose sum is σ = 22720500. Its totient is φ = 22699264.

The previous prime is 22709849. The next prime is 22709903. The reversal of 22709881 is 18890722.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 469225 + 22240656 = 685^2 + 4716^2 .

It is a cyclic number.

It is not a de Polignac number, because 22709881 - 2⁵ = 22709849 is a prime.

It is a super-2 number, since 2×22709881² = 1031477390068322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22709881.

It is not an unprimeable number, because it can be changed into a prime (22709831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 856 + ... + 6793.

It is an arithmetic number, because the mean of its divisors is an integer number (5680125).

Almost surely, 2^22709881 is an apocalyptic number.

It is an amenable number.

22709881 is a deficient number, since it is larger than the sum of its proper divisors (10619).

22709881 is an equidigital number, since it uses as much as digits as its factorization.

22709881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10618.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 22709881 is about 4765.4885373905. The cubic root of 22709881 is about 283.1858959176.

The spelling of 22709881 in words is "twenty-two million, seven hundred nine thousand, eight hundred eighty-one".