20045471 has 2 divisors, whose sum is σ = 20045472. Its totient is φ = 20045470.

The previous prime is 20045461. The next prime is 20045477. The reversal of 20045471 is 17454002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20045471 - 2¹⁰ = 20044447 is a prime.

It is a super-3 number, since 3×20045471³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20045477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10022735 + 10022736.

It is an arithmetic number, because the mean of its divisors is an integer number (10022736).

Almost surely, 2^20045471 is an apocalyptic number.

20045471 is a deficient number, since it is larger than the sum of its proper divisors (1).

20045471 is an equidigital number, since it uses as much as digits as its factorization.

20045471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 20045471 is about 4477.2168810546. The cubic root of 20045471 is about 271.6473180962.

Adding to 20045471 its reverse (17454002), we get a palindrome (37499473).

The spelling of 20045471 in words is "twenty million, forty-five thousand, four hundred seventy-one".