1820100202 has 4 divisors (see below), whose sum is σ = 2730150306. Its totient is φ = 910050100.

The previous prime is 1820100181. The next prime is 1820100221. The reversal of 1820100202 is 2020010281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2020010281 = 30949 ⋅65269.

It can be written as a sum of positive squares in only one way, i.e., 1816379161 + 3721041 = 42619^2 + 1929^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455025049 + ... + 455025052.

Almost surely, 2^1820100202 is an apocalyptic number.

1820100202 is a deficient number, since it is larger than the sum of its proper divisors (910050104).

1820100202 is an equidigital number, since it uses as much as digits as its factorization.

1820100202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910050103.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1820100202 is about 42662.6323847931. The cubic root of 1820100202 is about 1220.9515558452.

Adding to 1820100202 its reverse (2020010281), we get a palindrome (3840110483).

The spelling of 1820100202 in words is "one billion, eight hundred twenty million, one hundred thousand, two hundred two".