20138273 has 2 divisors, whose sum is σ = 20138274. Its totient is φ = 20138272.

The previous prime is 20138269. The next prime is 20138303. The reversal of 20138273 is 37283102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16386304 + 3751969 = 4048^2 + 1937^2 .

It is a cyclic number.

It is not a de Polignac number, because 20138273 - 2² = 20138269 is a prime.

It is not a weakly prime, because it can be changed into another prime (20138243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10069136 + 10069137.

It is an arithmetic number, because the mean of its divisors is an integer number (10069137).

Almost surely, 2^20138273 is an apocalyptic number.

It is an amenable number.

20138273 is a deficient number, since it is larger than the sum of its proper divisors (1).

20138273 is an equidigital number, since it uses as much as digits as its factorization.

20138273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20138273 is about 4487.5687181368. The cubic root of 20138273 is about 272.0658766692.

The spelling of 20138273 in words is "twenty million, one hundred thirty-eight thousand, two hundred seventy-three".