19948559 has 4 divisors (see below), whose sum is σ = 19959216. Its totient is φ = 19937904.

The previous prime is 19948541. The next prime is 19948583. The reversal of 19948559 is 95584991.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19948559 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 (19948519) 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, 1694 + ... + 6539.

It is an arithmetic number, because the mean of its divisors is an integer number (4989804).

Almost surely, 2^19948559 is an apocalyptic number.

19948559 is a deficient number, since it is larger than the sum of its proper divisors (10657).

19948559 is an equidigital number, since it uses as much as digits as its factorization.

19948559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10656.

The product of its digits is 583200, while the sum is 50.

The square root of 19948559 is about 4466.3809734504. The cubic root of 19948559 is about 271.2088412565.

The spelling of 19948559 in words is "nineteen million, nine hundred forty-eight thousand, five hundred fifty-nine".