20035553209 has 27 divisors (see below), whose sum is σ = 23715922797. Its totient is φ = 16876931904.

The previous prime is 20035553203. The next prime is 20035553221. The reversal of 20035553209 is 90235553002.

The square root of 20035553209 is 141547.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1631917609 + 18403635600 = 40397^2 + 135660^2 .

It is not a de Polignac number, because 20035553209 - 2¹³ = 20035545017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20035553203) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 72330379 + ... + 72330655.

It is an arithmetic number, because the mean of its divisors is an integer number (878367511).

Almost surely, 2^20035553209 is an apocalyptic number.

20035553209 is the 141547-th square number.

20035553209 is the 70774-th centered octagonal number.

It is an amenable number.

20035553209 is a deficient number, since it is larger than the sum of its proper divisors (3680369588).

20035553209 is an frugal number, since it uses more digits than its factorization.

20035553209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 34.

The spelling of 20035553209 in words is "twenty billion, thirty-five million, five hundred fifty-three thousand, two hundred nine".