20138801 has 2 divisors, whose sum is σ = 20138802. Its totient is φ = 20138800.

The previous prime is 20138743. The next prime is 20138819. The reversal of 20138801 is 10883102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14258176 + 5880625 = 3776^2 + 2425^2 .

It is a cyclic number.

It is not a de Polignac number, because 20138801 - 2¹⁸ = 19876657 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20138851) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10069400 + 10069401.

It is an arithmetic number, because the mean of its divisors is an integer number (10069401).

Almost surely, 2^20138801 is an apocalyptic number.

It is an amenable number.

20138801 is a deficient number, since it is larger than the sum of its proper divisors (1).

20138801 is an equidigital number, since it uses as much as digits as its factorization.

20138801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 20138801 is about 4487.6275469339. The cubic root of 20138801 is about 272.0682543893.

The spelling of 20138801 in words is "twenty million, one hundred thirty-eight thousand, eight hundred one".