19999801 has 4 divisors (see below), whose sum is σ = 20104704. Its totient is φ = 19894900.

The previous prime is 19999789. The next prime is 19999817. The reversal of 19999801 is 10899991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10899991 = 71 ⋅153521.

It is a cyclic number.

It is not a de Polignac number, because 19999801 - 2¹⁷ = 19868729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19999831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52165 + ... + 52546.

It is an arithmetic number, because the mean of its divisors is an integer number (5026176).

Almost surely, 2^19999801 is an apocalyptic number.

It is an amenable number.

19999801 is a deficient number, since it is larger than the sum of its proper divisors (104903).

19999801 is a wasteful number, since it uses less digits than its factorization.

19999801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104902.

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 19999801 is about 4472.1137060679. The cubic root of 19999801 is about 271.4408613747.

It can be divided in two parts, 199 and 99801, that added together give a 5-th power (100000 = 10⁵).

The spelling of 19999801 in words is "nineteen million, nine hundred ninety-nine thousand, eight hundred one".