20663732387 has 2 divisors, whose sum is σ = 20663732388. Its totient is φ = 20663732386.

The previous prime is 20663732347. The next prime is 20663732389. The reversal of 20663732387 is 78323736602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20663732387 - 2²⁴ = 20646955171 is a prime.

Together with 20663732389, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20663732389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331866193 + 10331866194.

It is an arithmetic number, because the mean of its divisors is an integer number (10331866194).

Almost surely, 2^20663732387 is an apocalyptic number.

20663732387 is a deficient number, since it is larger than the sum of its proper divisors (1).

20663732387 is an equidigital number, since it uses as much as digits as its factorization.

20663732387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 47.

The spelling of 20663732387 in words is "twenty billion, six hundred sixty-three million, seven hundred thirty-two thousand, three hundred eighty-seven".