202000001820 has 24 divisors (see below), whose sum is σ = 565600005264. Its totient is φ = 53866667136.

The previous prime is 202000001773. The next prime is 202000001831. The reversal of 202000001820 is 28100000202.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 202000001820.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1683333289 + ... + 1683333408.

It is an arithmetic number, because the mean of its divisors is an integer number (23566666886).

Almost surely, 2^202000001820 is an apocalyptic number.

202000001820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202000001820 is an abundant number, since it is smaller than the sum of its proper divisors (363600003444).

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

202000001820 is a wasteful number, since it uses less digits than its factorization.

202000001820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3366666709 (or 3366666707 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The spelling of 202000001820 in words is "two hundred two billion, one thousand, eight hundred twenty".