19955663 has 8 divisors (see below), whose sum is σ = 24560928. Its totient is φ = 15789024.

The previous prime is 19955653. The next prime is 19955711. The reversal of 19955663 is 36655991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19955663 - 2⁴ = 19955647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19955633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109556 + ... + 109737.

It is an arithmetic number, because the mean of its divisors is an integer number (3070116).

Almost surely, 2^19955663 is an apocalyptic number.

19955663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19955663 is a deficient number, since it is larger than the sum of its proper divisors (4605265).

19955663 is a wasteful number, since it uses less digits than its factorization.

19955663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219313.

The product of its digits is 218700, while the sum is 44.

The square root of 19955663 is about 4467.1761774078. The cubic root of 19955663 is about 271.2410313669.

The spelling of 19955663 in words is "nineteen million, nine hundred fifty-five thousand, six hundred sixty-three".