22091290 has 16 divisors (see below), whose sum is σ = 42823368. Its totient is φ = 8156736.

The previous prime is 22091273. The next prime is 22091291. The reversal of 22091290 is 9219022.

It can be written as a sum of positive squares in 4 ways, for example, as 14676561 + 7414729 = 3831^2 + 2723^2 .

It is not an unprimeable number, because it can be changed into a prime (22091291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84837 + ... + 85096.

Almost surely, 2^22091290 is an apocalyptic number.

22091290 is a deficient number, since it is larger than the sum of its proper divisors (20732078).

22091290 is a wasteful number, since it uses less digits than its factorization.

22091290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169953.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 22091290 is about 4700.1372320391. The cubic root of 22091290 is about 280.5909711997.

The spelling of 22091290 in words is "twenty-two million, ninety-one thousand, two hundred ninety".