20021788930205 has 8 divisors (see below), whose sum is σ = 24086062296504. Its totient is φ = 15977487424000.

The previous prime is 20021788930183. The next prime is 20021788930217. The reversal of 20021788930205 is 50203988712002.

It can be written as a sum of positive squares in 4 ways, for example, as 1708199334361 + 18313589595844 = 1306981^2 + 4279438^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20021788930205 - 2²⁸ = 20021520494749 is a prime.

It is a super-2 number, since 2×20021788930205² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021788930205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4992962816 + ... + 4992966825.

It is an arithmetic number, because the mean of its divisors is an integer number (3010757787063).

Almost surely, 2^{20021788930205} is an apocalyptic number.

It is an amenable number.

20021788930205 is a deficient number, since it is larger than the sum of its proper divisors (4064273366299).

20021788930205 is an equidigital number, since it uses as much as digits as its factorization.

20021788930205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9985930047.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 20021788930205 in words is "twenty trillion, twenty-one billion, seven hundred eighty-eight million, nine hundred thirty thousand, two hundred five".