20463654209 has 4 divisors (see below), whose sum is σ = 20463943380. Its totient is φ = 20463365040.

The previous prime is 20463654193. The next prime is 20463654217. The reversal of 20463654209 is 90245636402.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90245636402 = 2 ⋅45122818201.

It can be written as a sum of positive squares in 2 ways, for example, as 10141094209 + 10322560000 = 100703^2 + 101600^2 .

It is a cyclic number.

It is not a de Polignac number, because 20463654209 - 2⁴ = 20463654193 is a prime.

It is a super-2 number, since 2×20463654209² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20463654259) 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, 40787 + ... + 206375.

It is an arithmetic number, because the mean of its divisors is an integer number (5115985845).

Almost surely, 2^20463654209 is an apocalyptic number.

It is an amenable number.

20463654209 is a deficient number, since it is larger than the sum of its proper divisors (289171).

20463654209 is a wasteful number, since it uses less digits than its factorization.

20463654209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289170.

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 20463654209 in words is "twenty billion, four hundred sixty-three million, six hundred fifty-four thousand, two hundred nine".