20558387 has 2 divisors, whose sum is σ = 20558388. Its totient is φ = 20558386.

The previous prime is 20558341. The next prime is 20558443. The reversal of 20558387 is 78385502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20558387 - 2¹² = 20554291 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20558387.

It is not a weakly prime, because it can be changed into another prime (20551387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10279193 + 10279194.

It is an arithmetic number, because the mean of its divisors is an integer number (10279194).

Almost surely, 2^20558387 is an apocalyptic number.

20558387 is a deficient number, since it is larger than the sum of its proper divisors (1).

20558387 is an equidigital number, since it uses as much as digits as its factorization.

20558387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 20558387 is about 4534.1357500631. The cubic root of 20558387 is about 273.9447692681.

The spelling of 20558387 in words is "twenty million, five hundred fifty-eight thousand, three hundred eighty-seven".