20541571 has 2 divisors, whose sum is σ = 20541572. Its totient is φ = 20541570.

The previous prime is 20541557. The next prime is 20541583. The reversal of 20541571 is 17514502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20541571 - 2¹¹ = 20539523 is a prime.

It is a super-2 number, since 2×20541571² = 843912278296082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20541511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10270785 + 10270786.

It is an arithmetic number, because the mean of its divisors is an integer number (10270786).

Almost surely, 2^20541571 is an apocalyptic number.

20541571 is a deficient number, since it is larger than the sum of its proper divisors (1).

20541571 is an equidigital number, since it uses as much as digits as its factorization.

20541571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 20541571 is about 4532.2809930542. The cubic root of 20541571 is about 273.8700566648.

It can be divided in two parts, 20541 and 571, that added together give a palindrome (21112).

The spelling of 20541571 in words is "twenty million, five hundred forty-one thousand, five hundred seventy-one".