20674543 has 2 divisors, whose sum is σ = 20674544. Its totient is φ = 20674542.

The previous prime is 20674531. The next prime is 20674571. The reversal of 20674543 is 34547602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20674543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20674513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10337271 + 10337272.

It is an arithmetic number, because the mean of its divisors is an integer number (10337272).

Almost surely, 2^20674543 is an apocalyptic number.

20674543 is a deficient number, since it is larger than the sum of its proper divisors (1).

20674543 is an equidigital number, since it uses as much as digits as its factorization.

20674543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 20674543 is about 4546.9267643102. The cubic root of 20674543 is about 274.4597348823.

The spelling of 20674543 in words is "twenty million, six hundred seventy-four thousand, five hundred forty-three".