20664057907 has 2 divisors, whose sum is σ = 20664057908. Its totient is φ = 20664057906.

The previous prime is 20664057847. The next prime is 20664057919. The reversal of 20664057907 is 70975046602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20664057907 - 2¹¹ = 20664055859 is a prime.

It is not a weakly prime, because it can be changed into another prime (20664057937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10332028953 + 10332028954.

It is an arithmetic number, because the mean of its divisors is an integer number (10332028954).

Almost surely, 2^20664057907 is an apocalyptic number.

20664057907 is a deficient number, since it is larger than the sum of its proper divisors (1).

20664057907 is an equidigital number, since it uses as much as digits as its factorization.

20664057907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 46.

The spelling of 20664057907 in words is "twenty billion, six hundred sixty-four million, fifty-seven thousand, nine hundred seven".