20126131 has 2 divisors, whose sum is σ = 20126132. Its totient is φ = 20126130.

The previous prime is 20126129. The next prime is 20126137. The reversal of 20126131 is 13162102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20126131 - 2¹ = 20126129 is a prime.

It is a super-2 number, since 2×20126131² = 810122298058322, which contains 22 as substring.

Together with 20126129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20126137) 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, 10063065 + 10063066.

It is an arithmetic number, because the mean of its divisors is an integer number (10063066).

Almost surely, 2^20126131 is an apocalyptic number.

20126131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20126131 is an equidigital number, since it uses as much as digits as its factorization.

20126131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20126131 is about 4486.2156657923. The cubic root of 20126131 is about 272.0111866434.

Adding to 20126131 its reverse (13162102), we get a palindrome (33288233).

The spelling of 20126131 in words is "twenty million, one hundred twenty-six thousand, one hundred thirty-one".