22047709 has 4 divisors (see below), whose sum is σ = 22585500. Its totient is φ = 21509920.

The previous prime is 22047689. The next prime is 22047713. The reversal of 22047709 is 90774022.

It is a happy number.

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 2022084 + 20025625 = 1422^2 + 4475^2 .

It is a cyclic number.

It is not a de Polignac number, because 22047709 - 2⁹ = 22047197 is a prime.

It is a super-2 number, since 2×22047709² = 972202944297362, 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 (22047719) 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, 268834 + ... + 268915.

It is an arithmetic number, because the mean of its divisors is an integer number (5646375).

Almost surely, 2^22047709 is an apocalyptic number.

It is an amenable number.

22047709 is a deficient number, since it is larger than the sum of its proper divisors (537791).

22047709 is an equidigital number, since it uses as much as digits as its factorization.

22047709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537790.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 22047709 is about 4695.4988020444. The cubic root of 22047709 is about 280.4063360602.

The spelling of 22047709 in words is "twenty-two million, forty-seven thousand, seven hundred nine".