20531107 has 2 divisors, whose sum is σ = 20531108. Its totient is φ = 20531106.

The previous prime is 20531099. The next prime is 20531171. The reversal of 20531107 is 70113502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20531107 - 2³ = 20531099 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20535107) 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, 10265553 + 10265554.

It is an arithmetic number, because the mean of its divisors is an integer number (10265554).

Almost surely, 2^20531107 is an apocalyptic number.

20531107 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531107 is an equidigital number, since it uses as much as digits as its factorization.

20531107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 20531107 is about 4531.1264603849. The cubic root of 20531107 is about 273.8235450806.

Adding to 20531107 its reverse (70113502), we get a palindrome (90644609).

It can be divided in two parts, 2053 and 1107, that added together give a triangular number (3160 = T₇₉).

The spelling of 20531107 in words is "twenty million, five hundred thirty-one thousand, one hundred seven".