22505690 has 32 divisors (see below), whose sum is σ = 44029440. Its totient is φ = 8251200.

The previous prime is 22505689. The next prime is 22505723. The reversal of 22505690 is 9650522.

It is a super-2 number, since 2×22505690² = 1013012164752200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3980 + ... + 7800.

It is an arithmetic number, because the mean of its divisors is an integer number (1375920).

Almost surely, 2^22505690 is an apocalyptic number.

22505690 is a deficient number, since it is larger than the sum of its proper divisors (21523750).

22505690 is a wasteful number, since it uses less digits than its factorization.

22505690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3878.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 22505690 is about 4744.0162310009. The cubic root of 22505690 is about 282.3346044141.

The spelling of 22505690 in words is "twenty-two million, five hundred five thousand, six hundred ninety".