20909799982368 has 192 divisors, whose sum is σ = 67152971773440. Its totient is φ = 6277084934400.

The previous prime is 20909799982333. The next prime is 20909799982387. The reversal of 20909799982368 is 86328999790902.

It is a happy number.

20909799982368 is a `hidden beast` number, since 2 + 0 + 9 + 0 + 97 + 9 + 99 + 82 + 368 = 666.

It is a super-2 number, since 2×20909799982368² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9263938 + ... + 11297793.

It is an arithmetic number, because the mean of its divisors is an integer number (349755061320).

Almost surely, 2^{20909799982368} is an apocalyptic number.

It is an amenable number.

20909799982368 is an abundant number, since it is smaller than the sum of its proper divisors (46243171791072).

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

20909799982368 is a wasteful number, since it uses less digits than its factorization.

20909799982368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20561868 (or 20561854 counting only the distinct ones).

The product of its (nonzero) digits is 1904684544, while the sum is 81.

The spelling of 20909799982368 in words is "twenty trillion, nine hundred nine billion, seven hundred ninety-nine million, nine hundred eighty-two thousand, three hundred sixty-eight".