20087647 has 2 divisors, whose sum is σ = 20087648. Its totient is φ = 20087646.

The previous prime is 20087603. The next prime is 20087653. The reversal of 20087647 is 74678002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20087647 - 2⁷ = 20087519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20067647) 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, 10043823 + 10043824.

It is an arithmetic number, because the mean of its divisors is an integer number (10043824).

Almost surely, 2^20087647 is an apocalyptic number.

20087647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20087647 is an equidigital number, since it uses as much as digits as its factorization.

20087647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 20087647 is about 4481.9244750442. The cubic root of 20087647 is about 271.8377014407.

The spelling of 20087647 in words is "twenty million, eighty-seven thousand, six hundred forty-seven".