20650387 has 2 divisors, whose sum is σ = 20650388. Its totient is φ = 20650386.

The previous prime is 20650381. The next prime is 20650423. The reversal of 20650387 is 78305602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20650387 - 2³ = 20650379 is a prime.

It is not a weakly prime, because it can be changed into another prime (20650381) 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, 10325193 + 10325194.

It is an arithmetic number, because the mean of its divisors is an integer number (10325194).

Almost surely, 2^20650387 is an apocalyptic number.

20650387 is a deficient number, since it is larger than the sum of its proper divisors (1).

20650387 is an equidigital number, since it uses as much as digits as its factorization.

20650387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20650387 is about 4544.2696882998. The cubic root of 20650387 is about 274.3528009084.

Adding to 20650387 its reverse (78305602), we get a palindrome (98955989).

The spelling of 20650387 in words is "twenty million, six hundred fifty thousand, three hundred eighty-seven".