19800102 has 64 divisors (see below), whose sum is σ = 47923200. Its totient is φ = 5331744.

The previous prime is 19800101. The next prime is 19800119. The reversal of 19800102 is 20100891.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19800101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99399 + ... + 99597.

It is an arithmetic number, because the mean of its divisors is an integer number (748800).

Almost surely, 2^19800102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19800102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23961600).

19800102 is an abundant number, since it is smaller than the sum of its proper divisors (28123098).

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

19800102 is a wasteful number, since it uses less digits than its factorization.

19800102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 19800102 is about 4449.7305536403. The cubic root of 19800102 is about 270.5343874519.

Adding to 19800102 its reverse (20100891), we get a palindrome (39900993).

The spelling of 19800102 in words is "nineteen million, eight hundred thousand, one hundred two".