20434147 has 2 divisors, whose sum is σ = 20434148. Its totient is φ = 20434146.

The previous prime is 20434109. The next prime is 20434151. The reversal of 20434147 is 74143402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20434147 - 2¹¹ = 20432099 is a prime.

It is not a weakly prime, because it can be changed into another prime (20434157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217073 + 10217074.

It is an arithmetic number, because the mean of its divisors is an integer number (10217074).

Almost surely, 2^20434147 is an apocalyptic number.

20434147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434147 is an equidigital number, since it uses as much as digits as its factorization.

20434147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 20434147 is about 4520.4144721474. The cubic root of 20434147 is about 273.3918126247.

Adding to 20434147 its reverse (74143402), we get a palindrome (94577549).

The spelling of 20434147 in words is "twenty million, four hundred thirty-four thousand, one hundred forty-seven".