20003887 has 2 divisors, whose sum is σ = 20003888. Its totient is φ = 20003886.

The previous prime is 20003869. The next prime is 20003899. The reversal of 20003887 is 78830002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20003887 is a prime.

It is equal to p_1270837 and since 20003887 and 1270837 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20003857) 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, 10001943 + 10001944.

It is an arithmetic number, because the mean of its divisors is an integer number (10001944).

Almost surely, 2^20003887 is an apocalyptic number.

20003887 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003887 is an equidigital number, since it uses as much as digits as its factorization.

20003887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20003887 is about 4472.5705136979. The cubic root of 20003887 is about 271.4593454225.

Adding to 20003887 its reverse (78830002), we get a palindrome (98833889).

The spelling of 20003887 in words is "twenty million, three thousand, eight hundred eighty-seven".