20163911 has 2 divisors, whose sum is σ = 20163912. Its totient is φ = 20163910.

The previous prime is 20163889. The next prime is 20163931. The reversal of 20163911 is 11936102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20163911 - 2¹⁰ = 20162887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20163931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10081955 + 10081956.

It is an arithmetic number, because the mean of its divisors is an integer number (10081956).

Almost surely, 2^20163911 is an apocalyptic number.

20163911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20163911 is an equidigital number, since it uses as much as digits as its factorization.

20163911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 20163911 is about 4490.4243674735. The cubic root of 20163911 is about 272.1812832384.

The spelling of 20163911 in words is "twenty million, one hundred sixty-three thousand, nine hundred eleven".