20389111 has 2 divisors, whose sum is σ = 20389112. Its totient is φ = 20389110.

The previous prime is 20389097. The next prime is 20389129. The reversal of 20389111 is 11198302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20389111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20389151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10194555 + 10194556.

It is an arithmetic number, because the mean of its divisors is an integer number (10194556).

Almost surely, 2^20389111 is an apocalyptic number.

20389111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20389111 is an equidigital number, since it uses as much as digits as its factorization.

20389111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 20389111 is about 4515.4303227932. The cubic root of 20389111 is about 273.1908168739.

The spelling of 20389111 in words is "twenty million, three hundred eighty-nine thousand, one hundred eleven".