20138903 has 2 divisors, whose sum is σ = 20138904. Its totient is φ = 20138902.

The previous prime is 20138851. The next prime is 20138939. The reversal of 20138903 is 30983102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20138903 - 2¹⁴ = 20122519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20138303) 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, 10069451 + 10069452.

It is an arithmetic number, because the mean of its divisors is an integer number (10069452).

Almost surely, 2^20138903 is an apocalyptic number.

20138903 is a deficient number, since it is larger than the sum of its proper divisors (1).

20138903 is an equidigital number, since it uses as much as digits as its factorization.

20138903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 20138903 is about 4487.6389114990. The cubic root of 20138903 is about 272.0687137168.

The spelling of 20138903 in words is "twenty million, one hundred thirty-eight thousand, nine hundred three".