20134643 has 2 divisors, whose sum is σ = 20134644. Its totient is φ = 20134642.

The previous prime is 20134633. The next prime is 20134663. The reversal of 20134643 is 34643102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20134643 - 2⁴ = 20134627 is a prime.

It is not a weakly prime, because it can be changed into another prime (20134603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10067321 + 10067322.

It is an arithmetic number, because the mean of its divisors is an integer number (10067322).

Almost surely, 2^20134643 is an apocalyptic number.

20134643 is a deficient number, since it is larger than the sum of its proper divisors (1).

20134643 is an equidigital number, since it uses as much as digits as its factorization.

20134643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 20134643 is about 4487.1642492782. The cubic root of 20134643 is about 272.0495287186.

Adding to 20134643 its reverse (34643102), we get a palindrome (54777745).

The spelling of 20134643 in words is "twenty million, one hundred thirty-four thousand, six hundred forty-three".