20108547 has 8 divisors (see below), whose sum is σ = 29790480. Its totient is φ = 13405680.

The previous prime is 20108537. The next prime is 20108551. The reversal of 20108547 is 74580102.

It is not a de Polignac number, because 20108547 - 2⁴ = 20108531 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 744761 = 20108547 / (2 + 0 + 1 + 0 + 8 + 5 + 4 + 7).

It is a self number, because there is not a number n which added to its sum of digits gives 20108547.

It is not an unprimeable number, because it can be changed into a prime (20108537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 372354 + ... + 372407.

It is an arithmetic number, because the mean of its divisors is an integer number (3723810).

Almost surely, 2^20108547 is an apocalyptic number.

20108547 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20108547 is a deficient number, since it is larger than the sum of its proper divisors (9681933).

20108547 is an equidigital number, since it uses as much as digits as its factorization.

20108547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744770 (or 744764 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20108547 is about 4484.2554565948. The cubic root of 20108547 is about 271.9319457410.

Adding to 20108547 its reverse (74580102), we get a palindrome (94688649).

The spelling of 20108547 in words is "twenty million, one hundred eight thousand, five hundred forty-seven".