19802081 has 8 divisors (see below), whose sum is σ = 21389760. Its totient is φ = 18223632.

The previous prime is 19802077. The next prime is 19802089. The reversal of 19802081 is 18020891.

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 19802081 - 2² = 19802077 is a prime.

It is a super-2 number, since 2×19802081² = 784244823861122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19802089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2546 + ... + 6788.

It is an arithmetic number, because the mean of its divisors is an integer number (2673720).

Almost surely, 2^19802081 is an apocalyptic number.

It is an amenable number.

19802081 is a deficient number, since it is larger than the sum of its proper divisors (1587679).

19802081 is a wasteful number, since it uses less digits than its factorization.

19802081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4615.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 19802081 is about 4449.9529210993. The cubic root of 19802081 is about 270.5434003637.

The spelling of 19802081 in words is "nineteen million, eight hundred two thousand, eighty-one".