20265611 has 2 divisors, whose sum is σ = 20265612. Its totient is φ = 20265610.

The previous prime is 20265593. The next prime is 20265613. The reversal of 20265611 is 11656202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20265611 is a prime.

Together with 20265613, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20265613) 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, 10132805 + 10132806.

It is an arithmetic number, because the mean of its divisors is an integer number (10132806).

Almost surely, 2^20265611 is an apocalyptic number.

20265611 is a deficient number, since it is larger than the sum of its proper divisors (1).

20265611 is an equidigital number, since it uses as much as digits as its factorization.

20265611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 20265611 is about 4501.7342213862. The cubic root of 20265611 is about 272.6381130808.

It can be divided in two parts, 202656 and 11, that multiplied together give a triangular number (2229216 = T₂₁₁₁).

The spelling of 20265611 in words is "twenty million, two hundred sixty-five thousand, six hundred eleven".