20123611 has 2 divisors, whose sum is σ = 20123612. Its totient is φ = 20123610.

The previous prime is 20123581. The next prime is 20123617. The reversal of 20123611 is 11632102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20123611 - 2⁷ = 20123483 is a prime.

It is not a weakly prime, because it can be changed into another prime (20123617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061805 + 10061806.

It is an arithmetic number, because the mean of its divisors is an integer number (10061806).

Almost surely, 2^20123611 is an apocalyptic number.

20123611 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123611 is an equidigital number, since it uses as much as digits as its factorization.

20123611 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 20123611 is about 4485.9347966728. The cubic root of 20123611 is about 271.9998332972. Note that the first 3 decimals are identical.

Adding to 20123611 its reverse (11632102), we get a palindrome (31755713).

The spelling of 20123611 in words is "twenty million, one hundred twenty-three thousand, six hundred eleven".