20996958668 has 12 divisors (see below), whose sum is σ = 41993917392. Its totient is φ = 8998696560.

The previous prime is 20996958667. The next prime is 20996958677. The reversal of 20996958668 is 86685969902.

20996958668 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 20996958598 and 20996958607.

It is not an unprimeable number, because it can be changed into a prime (20996958667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374945663 + ... + 374945718.

It is an arithmetic number, because the mean of its divisors is an integer number (3499493116).

Almost surely, 2^20996958668 is an apocalyptic number.

20996958668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20996958668 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20996958668 is a wasteful number, since it uses less digits than its factorization.

20996958668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749891392 (or 749891390 counting only the distinct ones).

The product of its (nonzero) digits is 100776960, while the sum is 68.

The spelling of 20996958668 in words is "twenty billion, nine hundred ninety-six million, nine hundred fifty-eight thousand, six hundred sixty-eight".