20589181 has 2 divisors, whose sum is σ = 20589182. Its totient is φ = 20589180.

The previous prime is 20589157. The next prime is 20589187. The reversal of 20589181 is 18198502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18922500 + 1666681 = 4350^2 + 1291^2 .

It is a cyclic number.

It is not a de Polignac number, because 20589181 - 2⁹ = 20588669 is a prime.

It is a super-2 number, since 2×20589181² = 847828748501522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20589187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10294590 + 10294591.

It is an arithmetic number, because the mean of its divisors is an integer number (10294591).

Almost surely, 2^20589181 is an apocalyptic number.

It is an amenable number.

20589181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20589181 is an equidigital number, since it uses as much as digits as its factorization.

20589181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 20589181 is about 4537.5302753811. The cubic root of 20589181 is about 274.0814798437.

The spelling of 20589181 in words is "twenty million, five hundred eighty-nine thousand, one hundred eighty-one".