19906918 has 8 divisors (see below), whose sum is σ = 29891520. Its totient is φ = 9943080.

The previous prime is 19906907. The next prime is 19906933. The reversal of 19906918 is 81960991.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2518 + ... + 6793.

It is an arithmetic number, because the mean of its divisors is an integer number (3736440).

Almost surely, 2^19906918 is an apocalyptic number.

19906918 is a deficient number, since it is larger than the sum of its proper divisors (9984602).

19906918 is a wasteful number, since it uses less digits than its factorization.

19906918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10382.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 19906918 is about 4461.7169340961. The cubic root of 19906918 is about 271.0200009748.

The spelling of 19906918 in words is "nineteen million, nine hundred six thousand, nine hundred eighteen".