19807117 has 16 divisors (see below), whose sum is σ = 22855680. Its totient is φ = 16988400.

The previous prime is 19807103. The next prime is 19807121. The reversal of 19807117 is 71170891.

It is a de Polignac number, because none of the positive numbers 2^k-19807117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19807187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19492 + ... + 20482.

It is an arithmetic number, because the mean of its divisors is an integer number (1428480).

Almost surely, 2^19807117 is an apocalyptic number.

19807117 is the 3634-th pentagonal number.

It is an amenable number.

19807117 is a deficient number, since it is larger than the sum of its proper divisors (3048563).

19807117 is a wasteful number, since it uses less digits than its factorization.

19807117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104.

The product of its (nonzero) digits is 3528, while the sum is 34.

The square root of 19807117 is about 4450.5187338107. The cubic root of 19807117 is about 270.5663329885.

The spelling of 19807117 in words is "nineteen million, eight hundred seven thousand, one hundred seventeen".