20938658287 has 2 divisors, whose sum is σ = 20938658288. Its totient is φ = 20938658286.

The previous prime is 20938658269. The next prime is 20938658297. The reversal of 20938658287 is 78285683902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20938658287 - 2¹⁹ = 20938133999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20938658297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10469329143 + 10469329144.

It is an arithmetic number, because the mean of its divisors is an integer number (10469329144).

Almost surely, 2^20938658287 is an apocalyptic number.

20938658287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20938658287 is an equidigital number, since it uses as much as digits as its factorization.

20938658287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11612160, while the sum is 58.

The spelling of 20938658287 in words is "twenty billion, nine hundred thirty-eight million, six hundred fifty-eight thousand, two hundred eighty-seven".