19669923 has 72 divisors (see below), whose sum is σ = 36848448. Its totient is φ = 10015488.

The previous prime is 19669913. The next prime is 19669931. The reversal of 19669923 is 32996691.

It is a happy number.

It is not a de Polignac number, because 19669923 - 2⁴ = 19669907 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19669913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 269415 + ... + 269487.

It is an arithmetic number, because the mean of its divisors is an integer number (511784).

Almost surely, 2^19669923 is an apocalyptic number.

19669923 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19669923 is a deficient number, since it is larger than the sum of its proper divisors (17178525).

19669923 is a wasteful number, since it uses less digits than its factorization.

19669923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 143 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 19669923 is about 4435.0786915228. The cubic root of 19669923 is about 269.9401925144.

The spelling of 19669923 in words is "nineteen million, six hundred sixty-nine thousand, nine hundred twenty-three".