20712957887 has 2 divisors, whose sum is σ = 20712957888. Its totient is φ = 20712957886.

The previous prime is 20712957841. The next prime is 20712957929. The reversal of 20712957887 is 78875921702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20712957887 - 2⁸ = 20712957631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20712950887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356478943 + 10356478944.

It is an arithmetic number, because the mean of its divisors is an integer number (10356478944).

Almost surely, 2^20712957887 is an apocalyptic number.

20712957887 is a deficient number, since it is larger than the sum of its proper divisors (1).

20712957887 is an equidigital number, since it uses as much as digits as its factorization.

20712957887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3951360, while the sum is 56.

The spelling of 20712957887 in words is "twenty billion, seven hundred twelve million, nine hundred fifty-seven thousand, eight hundred eighty-seven".