19922081 has 4 divisors (see below), whose sum is σ = 19972164. Its totient is φ = 19872000.

The previous prime is 19922047. The next prime is 19922099. The reversal of 19922081 is 18022991.

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 18190225 + 1731856 = 4265^2 + 1316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19922081 is a prime.

It is a super-2 number, since 2×19922081² = 793778622741122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19922041) 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, 24440 + ... + 25241.

It is an arithmetic number, because the mean of its divisors is an integer number (4993041).

Almost surely, 2^19922081 is an apocalyptic number.

It is an amenable number.

19922081 is a deficient number, since it is larger than the sum of its proper divisors (50083).

19922081 is an equidigital number, since it uses as much as digits as its factorization.

19922081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50082.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 19922081 is about 4463.4158443954. The cubic root of 19922081 is about 271.0887950380.

The spelling of 19922081 in words is "nineteen million, nine hundred twenty-two thousand, eighty-one".