20791563307 has 2 divisors, whose sum is σ = 20791563308. Its totient is φ = 20791563306.

The previous prime is 20791563301. The next prime is 20791563343. The reversal of 20791563307 is 70336519702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20791563307 is a prime.

It is not a weakly prime, because it can be changed into another prime (20791563301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10395781653 + 10395781654.

It is an arithmetic number, because the mean of its divisors is an integer number (10395781654).

Almost surely, 2^20791563307 is an apocalyptic number.

20791563307 is a deficient number, since it is larger than the sum of its proper divisors (1).

20791563307 is an equidigital number, since it uses as much as digits as its factorization.

20791563307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 238140, while the sum is 43.

The spelling of 20791563307 in words is "twenty billion, seven hundred ninety-one million, five hundred sixty-three thousand, three hundred seven".