20534030209 has 27 divisors (see below), whose sum is σ = 26269552323. Its totient is φ = 15991945200.

The previous prime is 20534030191. The next prime is 20534030233. The reversal of 20534030209 is 90203043502.

The square root of 20534030209 is 143297.

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

It can be written as a sum of positive squares in only one way, i.e., 22061809 + 20511968400 = 4697^2 + 143220^2 .

It is not a de Polignac number, because 20534030209 - 2⁷ = 20534030081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20534030239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 11032939 + ... + 11034799.

Almost surely, 2^20534030209 is an apocalyptic number.

20534030209 is the 143297-th square number.

20534030209 is the 71649-th centered octagonal number.

It is an amenable number.

20534030209 is a deficient number, since it is larger than the sum of its proper divisors (5735522114).

20534030209 is an frugal number, since it uses more digits than its factorization.

20534030209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3758 (or 1879 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The spelling of 20534030209 in words is "twenty billion, five hundred thirty-four million, thirty thousand, two hundred nine".