20996688369920 has 36 divisors (see below), whose sum is σ = 50293630114140. Its totient is φ = 8398675347456.

The previous prime is 20996688369893. The next prime is 20996688369941. The reversal of 20996688369920 is 2996388669902.

It can be written as a sum of positive squares in 2 ways, for example, as 3429726210304 + 17566962159616 = 1851952^2 + 4191296^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8201830115 + ... + 8201832674.

Almost surely, 2^{20996688369920} is an apocalyptic number.

20996688369920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20996688369920 is an abundant number, since it is smaller than the sum of its proper divisors (29296941744220).

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

20996688369920 is an equidigital number, since it uses as much as digits as its factorization.

20996688369920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16403662810 (or 16403662796 counting only the distinct ones).

The product of its (nonzero) digits is 1088391168, while the sum is 77.

The spelling of 20996688369920 in words is "twenty trillion, nine hundred ninety-six billion, six hundred eighty-eight million, three hundred sixty-nine thousand, nine hundred twenty".