20003131 has 2 divisors, whose sum is σ = 20003132. Its totient is φ = 20003130.

The previous prime is 20003117. The next prime is 20003149. The reversal of 20003131 is 13130002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20003131 - 2⁷ = 20003003 is a prime.

It is a super-2 number, since 2×20003131² = 800250499606322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20003161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001565 + 10001566.

It is an arithmetic number, because the mean of its divisors is an integer number (10001566).

Almost surely, 2^20003131 is an apocalyptic number.

20003131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003131 is an equidigital number, since it uses as much as digits as its factorization.

20003131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 20003131 is about 4472.4859977422. The cubic root of 20003131 is about 271.4559256563.

Adding to 20003131 its reverse (13130002), we get a palindrome (33133133).

The spelling of 20003131 in words is "twenty million, three thousand, one hundred thirty-one".