20810147 has 4 divisors (see below), whose sum is σ = 21714960. Its totient is φ = 19905336.

The previous prime is 20810129. The next prime is 20810177. The reversal of 20810147 is 74101802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20810147 - 2²² = 16615843 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 904789 = 20810147 / (2 + 0 + 8 + 1 + 0 + 1 + 4 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20810117) 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 in 3 ways as a sum of consecutive naturals, for example, 452372 + ... + 452417.

It is an arithmetic number, because the mean of its divisors is an integer number (5428740).

Almost surely, 2^20810147 is an apocalyptic number.

20810147 is a deficient number, since it is larger than the sum of its proper divisors (904813).

20810147 is an equidigital number, since it uses as much as digits as its factorization.

20810147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904812.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 20810147 is about 4561.8140032228. The cubic root of 20810147 is about 275.0584867338.

Adding to 20810147 its reverse (74101802), we get a palindrome (94911949).

The spelling of 20810147 in words is "twenty million, eight hundred ten thousand, one hundred forty-seven".