20145911 has 2 divisors, whose sum is σ = 20145912. Its totient is φ = 20145910.

The previous prime is 20145899. The next prime is 20145943. The reversal of 20145911 is 11954102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20145911 - 2⁶ = 20145847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20145971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10072955 + 10072956.

It is an arithmetic number, because the mean of its divisors is an integer number (10072956).

Almost surely, 2^20145911 is an apocalyptic number.

20145911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20145911 is an equidigital number, since it uses as much as digits as its factorization.

20145911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 20145911 is about 4488.4196550679. The cubic root of 20145911 is about 272.1002685045.

The spelling of 20145911 in words is "twenty million, one hundred forty-five thousand, nine hundred eleven".