19913806 has 16 divisors (see below), whose sum is σ = 33281280. Its totient is φ = 8858680.

The previous prime is 19913779. The next prime is 19913863. The reversal of 19913806 is 60831991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8596 + ... + 10663.

It is an arithmetic number, because the mean of its divisors is an integer number (2080080).

Almost surely, 2^19913806 is an apocalyptic number.

19913806 is a deficient number, since it is larger than the sum of its proper divisors (13367474).

19913806 is a wasteful number, since it uses less digits than its factorization.

19913806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19319.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 19913806 is about 4462.4887674929. The cubic root of 19913806 is about 271.0512559468.

The spelling of 19913806 in words is "nineteen million, nine hundred thirteen thousand, eight hundred six".