20753099209 has 2 divisors, whose sum is σ = 20753099210. Its totient is φ = 20753099208.

The previous prime is 20753099179. The next prime is 20753099221. The reversal of 20753099209 is 90299035702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15919373584 + 4833725625 = 126172^2 + 69525^2 .

It is a cyclic number.

It is not a de Polignac number, because 20753099209 - 2²³ = 20744710601 is a prime.

It is a super-2 number, since 2×20753099209² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20753090209) 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 as a sum of consecutive naturals, namely, 10376549604 + 10376549605.

It is an arithmetic number, because the mean of its divisors is an integer number (10376549605).

Almost surely, 2^20753099209 is an apocalyptic number.

It is an amenable number.

20753099209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20753099209 is an equidigital number, since it uses as much as digits as its factorization.

20753099209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 306180, while the sum is 46.

The spelling of 20753099209 in words is "twenty billion, seven hundred fifty-three million, ninety-nine thousand, two hundred nine".