19992742 has 32 divisors (see below), whose sum is σ = 37635840. Its totient is φ = 7738080.

The previous prime is 19992701. The next prime is 19992757. The reversal of 19992742 is 24729991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30009 + ... + 30667.

It is an arithmetic number, because the mean of its divisors is an integer number (1176120).

Almost surely, 2^19992742 is an apocalyptic number.

19992742 is a deficient number, since it is larger than the sum of its proper divisors (17643098).

19992742 is a wasteful number, since it uses less digits than its factorization.

19992742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876.

The product of its digits is 81648, while the sum is 43.

The square root of 19992742 is about 4471.3244122967. The cubic root of 19992742 is about 271.4089222816.

The spelling of 19992742 in words is "nineteen million, nine hundred ninety-two thousand, seven hundred forty-two".