20731663207 has 2 divisors, whose sum is σ = 20731663208. Its totient is φ = 20731663206.

The previous prime is 20731663187. The next prime is 20731663213. The reversal of 20731663207 is 70236613702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20731663207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20731663607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365831603 + 10365831604.

It is an arithmetic number, because the mean of its divisors is an integer number (10365831604).

Almost surely, 2^20731663207 is an apocalyptic number.

20731663207 is a deficient number, since it is larger than the sum of its proper divisors (1).

20731663207 is an equidigital number, since it uses as much as digits as its factorization.

20731663207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 37.

The spelling of 20731663207 in words is "twenty billion, seven hundred thirty-one million, six hundred sixty-three thousand, two hundred seven".