20105131 has 2 divisors, whose sum is σ = 20105132. Its totient is φ = 20105130.

The previous prime is 20105119. The next prime is 20105147. The reversal of 20105131 is 13150102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20105131 - 2⁹ = 20104619 is a prime.

It is a super-2 number, since 2×20105131² = 808432585054322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20105191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10052565 + 10052566.

It is an arithmetic number, because the mean of its divisors is an integer number (10052566).

Almost surely, 2^20105131 is an apocalyptic number.

20105131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20105131 is an equidigital number, since it uses as much as digits as its factorization.

20105131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 20105131 is about 4483.8745522149. The cubic root of 20105131 is about 271.9165464495.

Adding to 20105131 its reverse (13150102), we get a palindrome (33255233).

The spelling of 20105131 in words is "twenty million, one hundred five thousand, one hundred thirty-one".