20560387 has 2 divisors, whose sum is σ = 20560388. Its totient is φ = 20560386.

The previous prime is 20560381. The next prime is 20560403. The reversal of 20560387 is 78306502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20560387 - 2¹¹ = 20558339 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20560381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10280193 + 10280194.

It is an arithmetic number, because the mean of its divisors is an integer number (10280194).

Almost surely, 2^20560387 is an apocalyptic number.

20560387 is a deficient number, since it is larger than the sum of its proper divisors (1).

20560387 is an equidigital number, since it uses as much as digits as its factorization.

20560387 is an evil number, because the sum of its binary digits is even.

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

The square root of 20560387 is about 4534.3562938966. The cubic root of 20560387 is about 273.9536524516.

Adding to 20560387 its reverse (78306502), we get a palindrome (98866889).

The spelling of 20560387 in words is "twenty million, five hundred sixty thousand, three hundred eighty-seven".