20638043 has 2 divisors, whose sum is σ = 20638044. Its totient is φ = 20638042.

The previous prime is 20638019. The next prime is 20638081. The reversal of 20638043 is 34083602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20638043 - 2¹⁶ = 20572507 is a prime.

It is not a weakly prime, because it can be changed into another prime (20638003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10319021 + 10319022.

It is an arithmetic number, because the mean of its divisors is an integer number (10319022).

Almost surely, 2^20638043 is an apocalyptic number.

20638043 is a deficient number, since it is larger than the sum of its proper divisors (1).

20638043 is an equidigital number, since it uses as much as digits as its factorization.

20638043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20638043 is about 4542.9112912316. The cubic root of 20638043 is about 274.2981241931.

The spelling of 20638043 in words is "twenty million, six hundred thirty-eight thousand, forty-three".