20131147 has 2 divisors, whose sum is σ = 20131148. Its totient is φ = 20131146.

The previous prime is 20131129. The next prime is 20131207. The reversal of 20131147 is 74113102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20131147 - 2⁷ = 20131019 is a prime.

It is not a weakly prime, because it can be changed into another prime (20131117) 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, 10065573 + 10065574.

It is an arithmetic number, because the mean of its divisors is an integer number (10065574).

Almost surely, 2^20131147 is an apocalyptic number.

20131147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20131147 is an equidigital number, since it uses as much as digits as its factorization.

20131147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 20131147 is about 4486.7746767584. The cubic root of 20131147 is about 272.0337823885.

Adding to 20131147 its reverse (74113102), we get a palindrome (94244249).

It can be divided in two parts, 2013 and 1147, that added together give a triangular number (3160 = T₇₉).

The spelling of 20131147 in words is "twenty million, one hundred thirty-one thousand, one hundred forty-seven".