20673520318899 has 32 divisors (see below), whose sum is σ = 35003195504640. Its totient is φ = 11813301881856.

The previous prime is 20673520318811. The next prime is 20673520318903. The reversal of 20673520318899 is 99881302537602.

20673520318899 is a `hidden beast` number, since 2 + 0 + 6 + 7 + 3 + 520 + 3 + 18 + 8 + 99 = 666.

It is not a de Polignac number, because 20673520318899 - 2¹⁶ = 20673520253363 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (20673520398899) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16799974 + ... + 17988500.

It is an arithmetic number, because the mean of its divisors is an integer number (1093849859520).

Almost surely, 2^{20673520318899} is an apocalyptic number.

20673520318899 is a deficient number, since it is larger than the sum of its proper divisors (14329675185741).

20673520318899 is a wasteful number, since it uses less digits than its factorization.

20673520318899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280576 (or 1280570 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 63.

The spelling of 20673520318899 in words is "twenty trillion, six hundred seventy-three billion, five hundred twenty million, three hundred eighteen thousand, eight hundred ninety-nine".