22051986 has 64 divisors (see below), whose sum is σ = 51148800. Its totient is φ = 6272640.

The previous prime is 22051979. The next prime is 22051993. The reversal of 22051986 is 68915022.

It is an interprime number because it is at equal distance from previous prime (22051979) and next prime (22051993).

It is a Harshad number since it is a multiple of its sum of digits (33).

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 31 ways as a sum of consecutive naturals, for example, 110715 + ... + 110913.

It is an arithmetic number, because the mean of its divisors is an integer number (799200).

Almost surely, 2^22051986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22051986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25574400).

22051986 is an abundant number, since it is smaller than the sum of its proper divisors (29096814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22051986 is a wasteful number, since it uses less digits than its factorization.

22051986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 22051986 is about 4695.9542161312. The cubic root of 22051986 is about 280.4244667476.

The spelling of 22051986 in words is "twenty-two million, fifty-one thousand, nine hundred eighty-six".