19802000 has 40 divisors (see below), whose sum is σ = 47886072. Its totient is φ = 7920000.

The previous prime is 19801997. The next prime is 19802017. The reversal of 19802000 is 20891.

It can be written as a sum of positive squares in 4 ways, for example, as 123904 + 19678096 = 352^2 + 4436^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2951 + ... + 6950.

Almost surely, 2^19802000 is an apocalyptic number.

19802000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19802000 is an abundant number, since it is smaller than the sum of its proper divisors (28084072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19802000 is an equidigital number, since it uses as much as digits as its factorization.

19802000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9924 (or 9908 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 19802000 is about 4449.9438198701. The cubic root of 19802000 is about 270.5430314791.

Adding to 19802000 its reverse (20891), we get a palindrome (19822891).

The spelling of 19802000 in words is "nineteen million, eight hundred two thousand".