202012020209 has 4 divisors (see below), whose sum is σ = 203799737316. Its totient is φ = 200224303104.

The previous prime is 202012020179. The next prime is 202012020227. The reversal of 202012020209 is 902020210202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29644230625 + 172367789584 = 172175^2 + 415172^2 .

It is a cyclic number.

It is not a de Polignac number, because 202012020209 - 2¹⁶ = 202011954673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202012022209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893858384 + ... + 893858609.

It is an arithmetic number, because the mean of its divisors is an integer number (50949934329).

Almost surely, 2^202012020209 is an apocalyptic number.

It is an amenable number.

202012020209 is a deficient number, since it is larger than the sum of its proper divisors (1787717107).

202012020209 is a wasteful number, since it uses less digits than its factorization.

202012020209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787717106.

The product of its (nonzero) digits is 288, while the sum is 20.

The spelling of 202012020209 in words is "two hundred two billion, twelve million, twenty thousand, two hundred nine".