20061571 has 4 divisors (see below), whose sum is σ = 20076832. Its totient is φ = 20046312.

The previous prime is 20061553. The next prime is 20061583. The reversal of 20061571 is 17516002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20061571 - 2⁵ = 20061539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20061271) 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 in 3 ways as a sum of consecutive naturals, for example, 5451 + ... + 8356.

It is an arithmetic number, because the mean of its divisors is an integer number (5019208).

Almost surely, 2^20061571 is an apocalyptic number.

20061571 is a deficient number, since it is larger than the sum of its proper divisors (15261).

20061571 is a wasteful number, since it uses less digits than its factorization.

20061571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15260.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 20061571 is about 4479.0145121444. The cubic root of 20061571 is about 271.7200253168.

Adding to 20061571 its reverse (17516002), we get a palindrome (37577573).

The spelling of 20061571 in words is "twenty million, sixty-one thousand, five hundred seventy-one".