19908242 has 8 divisors (see below), whose sum is σ = 29940300. Its totient is φ = 9928144.

The previous prime is 19908233. The next prime is 19908253. The reversal of 19908242 is 24280991.

It can be written as a sum of positive squares in 2 ways, for example, as 19722481 + 185761 = 4441^2 + 431^2 .

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

It is an unprimeable number.

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, 12017 + ... + 13572.

Almost surely, 2^19908242 is an apocalyptic number.

19908242 is a deficient number, since it is larger than the sum of its proper divisors (10032058).

19908242 is a wasteful number, since it uses less digits than its factorization.

19908242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25980.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 19908242 is about 4461.8653050042. The cubic root of 19908242 is about 271.0260093136.

The spelling of 19908242 in words is "nineteen million, nine hundred eight thousand, two hundred forty-two".