20854264822609 has 3 divisors (see below), whose sum is σ = 20854269389257. Its totient is φ = 20854260255962.

The previous prime is 20854264822513. The next prime is 20854264822691. The reversal of 20854264822609 is 90622846245802.

The square root of 20854264822609 is 4566647.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-20854264822609 is a prime.

It is a super-2 number, since 2×20854264822609² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20854264822009) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2283324 + ... + 6849970.

Almost surely, 2^{20854264822609} is an apocalyptic number.

20854264822609 is the 4566647-th square number.

20854264822609 is the 2283324-th centered octagonal number.

It is an amenable number.

20854264822609 is a deficient number, since it is larger than the sum of its proper divisors (4566648).

20854264822609 is an frugal number, since it uses more digits than its factorization.

20854264822609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9133294 (or 4566647 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 58.

The spelling of 20854264822609 in words is "twenty trillion, eight hundred fifty-four billion, two hundred sixty-four million, eight hundred twenty-two thousand, six hundred nine".