20090071 has 2 divisors, whose sum is σ = 20090072. Its totient is φ = 20090070.

The previous prime is 20090053. The next prime is 20090093. The reversal of 20090071 is 17009002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20090071 - 2¹⁷ = 19958999 is a prime.

It is a super-2 number, since 2×20090071² = 807221905570082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20090471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10045035 + 10045036.

It is an arithmetic number, because the mean of its divisors is an integer number (10045036).

Almost surely, 2^20090071 is an apocalyptic number.

20090071 is a deficient number, since it is larger than the sum of its proper divisors (1).

20090071 is an equidigital number, since it uses as much as digits as its factorization.

20090071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 20090071 is about 4482.1948864368. The cubic root of 20090071 is about 271.8486353260.

Adding to 20090071 its reverse (17009002), we get a palindrome (37099073).

The spelling of 20090071 in words is "twenty million, ninety thousand, seventy-one".