20473365636 has 72 divisors (see below), whose sum is σ = 54285364224. Its totient is φ = 6493512960.

The previous prime is 20473365631. The next prime is 20473365637. The reversal of 20473365636 is 63656337402.

20473365636 is a `hidden beast` number, since 2 + 0 + 4 + 7 + 3 + 3 + 6 + 5 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20473365591 and 20473365600.

It is not an unprimeable number, because it can be changed into a prime (20473365631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93420 + ... + 222876.

It is an arithmetic number, because the mean of its divisors is an integer number (753963392).

Almost surely, 2^20473365636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20473365636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27142682112).

20473365636 is an abundant number, since it is smaller than the sum of its proper divisors (33811998588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20473365636 is a wasteful number, since it uses less digits than its factorization.

20473365636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129681 (or 129676 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 45.

The spelling of 20473365636 in words is "twenty billion, four hundred seventy-three million, three hundred sixty-five thousand, six hundred thirty-six".