20120189 has 2 divisors, whose sum is σ = 20120190. Its totient is φ = 20120188.

The previous prime is 20120161. The next prime is 20120203. The reversal of 20120189 is 98102102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14760964 + 5359225 = 3842^2 + 2315^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120189 - 2⁸ = 20119933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20126189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060094 + 10060095.

It is an arithmetic number, because the mean of its divisors is an integer number (10060095).

Almost surely, 2^20120189 is an apocalyptic number.

It is an amenable number.

20120189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120189 is an equidigital number, since it uses as much as digits as its factorization.

20120189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 20120189 is about 4485.5533660854. The cubic root of 20120189 is about 271.9844146563.

The spelling of 20120189 in words is "twenty million, one hundred twenty thousand, one hundred eighty-nine".