22051985 has 4 divisors (see below), whose sum is σ = 26462388. Its totient is φ = 17641584.

The previous prime is 22051979. The next prime is 22051993. The reversal of 22051985 is 58915022.

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 10916416 + 11135569 = 3304^2 + 3337^2 .

It is a cyclic number.

It is not a de Polignac number, because 22051985 - 2¹⁶ = 21986449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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, 2205194 + ... + 2205203.

It is an arithmetic number, because the mean of its divisors is an integer number (6615597).

Almost surely, 2^22051985 is an apocalyptic number.

It is an amenable number.

22051985 is a deficient number, since it is larger than the sum of its proper divisors (4410403).

22051985 is an equidigital number, since it uses as much as digits as its factorization.

22051985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4410402.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 22051985 is about 4695.9541096565. The cubic root of 22051985 is about 280.4244625087.

The spelling of 22051985 in words is "twenty-two million, fifty-one thousand, nine hundred eighty-five".