19896623 has 4 divisors (see below), whose sum is σ = 19945680. Its totient is φ = 19847568.

The previous prime is 19896607. The next prime is 19896631. The reversal of 19896623 is 32669891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32669891 = 97 ⋅336803.

It is a cyclic number.

It is not a de Polignac number, because 19896623 - 2⁴ = 19896607 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 (19892623) 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, 23915 + ... + 24732.

It is an arithmetic number, because the mean of its divisors is an integer number (4986420).

Almost surely, 2^19896623 is an apocalyptic number.

19896623 is a deficient number, since it is larger than the sum of its proper divisors (49057).

19896623 is an equidigital number, since it uses as much as digits as its factorization.

19896623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49056.

The product of its digits is 139968, while the sum is 44.

The square root of 19896623 is about 4460.5630810471. The cubic root of 19896623 is about 270.9732729641.

The spelling of 19896623 in words is "nineteen million, eight hundred ninety-six thousand, six hundred twenty-three".