20318147 has 4 divisors (see below), whose sum is σ = 20750496. Its totient is φ = 19885800.

The previous prime is 20318119. The next prime is 20318149. The reversal of 20318147 is 74181302.

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 20318147 - 2¹⁶ = 20252611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20318149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216104 + ... + 216197.

It is an arithmetic number, because the mean of its divisors is an integer number (5187624).

Almost surely, 2^20318147 is an apocalyptic number.

20318147 is a deficient number, since it is larger than the sum of its proper divisors (432349).

20318147 is an equidigital number, since it uses as much as digits as its factorization.

20318147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432348.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 20318147 is about 4507.5655291964. The cubic root of 20318147 is about 272.8735029174.

Adding to 20318147 its reverse (74181302), we get a palindrome (94499449).

The spelling of 20318147 in words is "twenty million, three hundred eighteen thousand, one hundred forty-seven".