20423300209 has 4 divisors (see below), whose sum is σ = 21994323316. Its totient is φ = 18852277104.

The previous prime is 20423300207. The next prime is 20423300263. The reversal of 20423300209 is 90200332402.

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 1274275809 + 19149024400 = 35697^2 + 138380^2 .

It is a cyclic number.

It is not a de Polignac number, because 20423300209 - 2¹ = 20423300207 is a prime.

It is a super-2 number, since 2×20423300209² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20423300201) 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, 785511534 + ... + 785511559.

It is an arithmetic number, because the mean of its divisors is an integer number (5498580829).

Almost surely, 2^20423300209 is an apocalyptic number.

It is an amenable number.

20423300209 is a deficient number, since it is larger than the sum of its proper divisors (1571023107).

20423300209 is a wasteful number, since it uses less digits than its factorization.

20423300209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571023106.

The product of its (nonzero) digits is 2592, while the sum is 25.

The spelling of 20423300209 in words is "twenty billion, four hundred twenty-three million, three hundred thousand, two hundred nine".