19915023 has 4 divisors (see below), whose sum is σ = 26553368. Its totient is φ = 13276680.

The previous prime is 19915009. The next prime is 19915039. The reversal of 19915023 is 32051991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32051991 = 3 ⋅10683997.

It is not a de Polignac number, because 19915023 - 2⁶ = 19914959 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 (19915043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3319168 + ... + 3319173.

It is an arithmetic number, because the mean of its divisors is an integer number (6638342).

Almost surely, 2^19915023 is an apocalyptic number.

19915023 is a deficient number, since it is larger than the sum of its proper divisors (6638345).

19915023 is an equidigital number, since it uses as much as digits as its factorization.

19915023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6638344.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 19915023 is about 4462.6251242962. The cubic root of 19915023 is about 271.0567774539.

The spelling of 19915023 in words is "nineteen million, nine hundred fifteen thousand, twenty-three".