20547887 has 2 divisors, whose sum is σ = 20547888. Its totient is φ = 20547886.

The previous prime is 20547881. The next prime is 20547931. The reversal of 20547887 is 78874502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20547887 - 2¹⁴ = 20531503 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20547881) 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, 10273943 + 10273944.

It is an arithmetic number, because the mean of its divisors is an integer number (10273944).

Almost surely, 2^20547887 is an apocalyptic number.

20547887 is a deficient number, since it is larger than the sum of its proper divisors (1).

20547887 is an equidigital number, since it uses as much as digits as its factorization.

20547887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 20547887 is about 4532.9777188952. The cubic root of 20547887 is about 273.8981231001.

The spelling of 20547887 in words is "twenty million, five hundred forty-seven thousand, eight hundred eighty-seven".