20572147 has 2 divisors, whose sum is σ = 20572148. Its totient is φ = 20572146.

The previous prime is 20572133. The next prime is 20572151. The reversal of 20572147 is 74127502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20572147 - 2²³ = 12183539 is a prime.

It is not a weakly prime, because it can be changed into another prime (20572177) 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, 10286073 + 10286074.

It is an arithmetic number, because the mean of its divisors is an integer number (10286074).

Almost surely, 2^20572147 is an apocalyptic number.

20572147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20572147 is an equidigital number, since it uses as much as digits as its factorization.

20572147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 20572147 is about 4535.6528747249. The cubic root of 20572147 is about 274.0058739217.

Adding to 20572147 its reverse (74127502), we get a palindrome (94699649).

The spelling of 20572147 in words is "twenty million, five hundred seventy-two thousand, one hundred forty-seven".