19908742 has 16 divisors (see below), whose sum is σ = 34924032. Its totient is φ = 8333640.

The previous prime is 19908719. The next prime is 19908743. The reversal of 19908742 is 24780991.

It is a junction number, because it is equal to n+sod(n) for n = 19908695 and 19908704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19908743) 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, 15934 + ... + 17137.

It is an arithmetic number, because the mean of its divisors is an integer number (2182752).

Almost surely, 2^19908742 is an apocalyptic number.

19908742 is a deficient number, since it is larger than the sum of its proper divisors (15015290).

19908742 is a wasteful number, since it uses less digits than its factorization.

19908742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33123.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 19908742 is about 4461.9213350305. The cubic root of 19908742 is about 271.0282782544.

The spelling of 19908742 in words is "nineteen million, nine hundred eight thousand, seven hundred forty-two".