19699923 has 16 divisors (see below), whose sum is σ = 28287360. Its totient is φ = 12149376.

The previous prime is 19699879. The next prime is 19699951. The reversal of 19699923 is 32999691.

It is not a de Polignac number, because 19699923 - 2¹² = 19695827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19699223) 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, 265 + ... + 6282.

It is an arithmetic number, because the mean of its divisors is an integer number (1767960).

Almost surely, 2^19699923 is an apocalyptic number.

19699923 is a deficient number, since it is larger than the sum of its proper divisors (8587437).

19699923 is a wasteful number, since it uses less digits than its factorization.

19699923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6626.

The product of its digits is 236196, while the sum is 48.

The square root of 19699923 is about 4438.4595300622. The cubic root of 19699923 is about 270.0773578066.

The spelling of 19699923 in words is "nineteen million, six hundred ninety-nine thousand, nine hundred twenty-three".