20380471 has 2 divisors, whose sum is σ = 20380472. Its totient is φ = 20380470.

The previous prime is 20380457. The next prime is 20380489. The reversal of 20380471 is 17408302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20380471 - 2⁵ = 20380439 is a prime.

It is a super-3 number, since 3×20380471³ (a number of 23 digits) contains 333 as substring.

It is equal to p_1293208 and since 20380471 and 1293208 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20380271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10190235 + 10190236.

It is an arithmetic number, because the mean of its divisors is an integer number (10190236).

Almost surely, 2^20380471 is an apocalyptic number.

20380471 is a deficient number, since it is larger than the sum of its proper divisors (1).

20380471 is an equidigital number, since it uses as much as digits as its factorization.

20380471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20380471 is about 4514.4735019712. The cubic root of 20380471 is about 273.1522227089.

Adding to 20380471 its reverse (17408302), we get a palindrome (37788773).

The spelling of 20380471 in words is "twenty million, three hundred eighty thousand, four hundred seventy-one".