19722842 has 8 divisors (see below), whose sum is σ = 30604500. Its totient is φ = 9521344.

The previous prime is 19722841. The next prime is 19722881. The reversal of 19722842 is 24822791.

It can be written as a sum of positive squares in 2 ways, for example, as 19722481 + 361 = 4441^2 + 19^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (19722841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169967 + ... + 170082.

Almost surely, 2^19722842 is an apocalyptic number.

19722842 is a deficient number, since it is larger than the sum of its proper divisors (10881658).

19722842 is a wasteful number, since it uses less digits than its factorization.

19722842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340080.

The product of its digits is 16128, while the sum is 35.

The square root of 19722842 is about 4441.0406438131. The cubic root of 19722842 is about 270.1820537160.

The spelling of 19722842 in words is "nineteen million, seven hundred twenty-two thousand, eight hundred forty-two".