19906105 has 8 divisors (see below), whose sum is σ = 24070464. Its totient is φ = 15802800.

The previous prime is 19906097. The next prime is 19906147. The reversal of 19906105 is 50160991.

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

It is not a de Polignac number, because 19906105 - 2³ = 19906097 is a prime.

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, 14541 + ... + 15850.

It is an arithmetic number, because the mean of its divisors is an integer number (3008808).

Almost surely, 2^19906105 is an apocalyptic number.

It is an amenable number.

19906105 is a deficient number, since it is larger than the sum of its proper divisors (4164359).

19906105 is a wasteful number, since it uses less digits than its factorization.

19906105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30527.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 19906105 is about 4461.6258247415. The cubic root of 19906105 is about 271.0163114322.

The spelling of 19906105 in words is "nineteen million, nine hundred six thousand, one hundred five".