20831903 has 2 divisors, whose sum is σ = 20831904. Its totient is φ = 20831902.

The previous prime is 20831893. The next prime is 20831911. The reversal of 20831903 is 30913802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20831903 - 2¹⁰ = 20830879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20831983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10415951 + 10415952.

It is an arithmetic number, because the mean of its divisors is an integer number (10415952).

Almost surely, 2^20831903 is an apocalyptic number.

20831903 is a deficient number, since it is larger than the sum of its proper divisors (1).

20831903 is an equidigital number, since it uses as much as digits as its factorization.

20831903 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 20831903 is about 4564.1979580207. The cubic root of 20831903 is about 275.1543067883.

The spelling of 20831903 in words is "twenty million, eight hundred thirty-one thousand, nine hundred three".