20668944907 has 16 divisors (see below), whose sum is σ = 22440442752. Its totient is φ = 18923627520.

The previous prime is 20668944889. The next prime is 20668944911. The reversal of 20668944907 is 70944986602.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20668944907 - 2¹¹ = 20668942859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20668945907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2419678 + ... + 2428204.

It is an arithmetic number, because the mean of its divisors is an integer number (1402527672).

Almost surely, 2^20668944907 is an apocalyptic number.

20668944907 is a deficient number, since it is larger than the sum of its proper divisors (1771497845).

20668944907 is a wasteful number, since it uses less digits than its factorization.

20668944907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10038.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 20668944907 in words is "twenty billion, six hundred sixty-eight million, nine hundred forty-four thousand, nine hundred seven".