19998022 has 16 divisors (see below), whose sum is σ = 32825232. Its totient is φ = 9061920.

The previous prime is 19997993. The next prime is 19998029. The reversal of 19998022 is 22089991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998029) 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, 6988 + ... + 9424.

It is an arithmetic number, because the mean of its divisors is an integer number (2051577).

Almost surely, 2^19998022 is an apocalyptic number.

19998022 is a deficient number, since it is larger than the sum of its proper divisors (12827210).

19998022 is a wasteful number, since it uses less digits than its factorization.

19998022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 19998022 is about 4471.9148024085. The cubic root of 19998022 is about 271.4328128344.

It can be divided in two parts, 199980 and 22, that added together give a palindrome (200002).

The spelling of 19998022 in words is "nineteen million, nine hundred ninety-eight thousand, twenty-two".