19965023 has 16 divisors (see below), whose sum is σ = 22450176. Its totient is φ = 17629920.

The previous prime is 19965019. The next prime is 19965041. The reversal of 19965023 is 32056991.

It is a cyclic number.

It is not a de Polignac number, because 19965023 - 2² = 19965019 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 (19965013) 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, 42890 + ... + 43352.

It is an arithmetic number, because the mean of its divisors is an integer number (1403136).

Almost surely, 2^19965023 is an apocalyptic number.

19965023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19965023 is a deficient number, since it is larger than the sum of its proper divisors (2485153).

19965023 is a wasteful number, since it uses less digits than its factorization.

19965023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 19965023 is about 4468.2236962802. The cubic root of 19965023 is about 271.2834323506.

The spelling of 19965023 in words is "nineteen million, nine hundred sixty-five thousand, twenty-three".