19802993 has 4 divisors (see below), whose sum is σ = 22632000. Its totient is φ = 16973988.

The previous prime is 19802987. The next prime is 19802999. The reversal of 19802993 is 39920891.

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: 39920891 = 37 ⋅1078943.

It is an interprime number because it is at equal distance from previous prime (19802987) and next prime (19802999).

It is a cyclic number.

It is not a de Polignac number, because 19802993 - 2¹⁶ = 19737457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19802993.

It is not an unprimeable number, because it can be changed into a prime (19802999) 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 3 ways as a sum of consecutive naturals, for example, 1414493 + ... + 1414506.

It is an arithmetic number, because the mean of its divisors is an integer number (5658000).

Almost surely, 2^19802993 is an apocalyptic number.

It is an amenable number.

19802993 is a deficient number, since it is larger than the sum of its proper divisors (2829007).

19802993 is an equidigital number, since it uses as much as digits as its factorization.

19802993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2829006.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 19802993 is about 4450.0553929137. The cubic root of 19802993 is about 270.5475536611.

The spelling of 19802993 in words is "nineteen million, eight hundred two thousand, nine hundred ninety-three".