202020109 has 4 divisors (see below), whose sum is σ = 210803616. Its totient is φ = 193236604.

The previous prime is 202020089. The next prime is 202020113. The reversal of 202020109 is 901020202.

It is a happy number.

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: 901020202 = 2 ⋅450510101.

It is a cyclic number.

It is not a de Polignac number, because 202020109 - 2¹³ = 202011917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202020092 and 202020101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202020139) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4391719 + ... + 4391764.

It is an arithmetic number, because the mean of its divisors is an integer number (52700904).

Almost surely, 2^202020109 is an apocalyptic number.

It is an amenable number.

202020109 is a deficient number, since it is larger than the sum of its proper divisors (8783507).

202020109 is an equidigital number, since it uses as much as digits as its factorization.

202020109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8783506.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 202020109 is about 14213.3778180980. The cubic root of 202020109 is about 586.7659003038.

The spelling of 202020109 in words is "two hundred two million, twenty thousand, one hundred nine".