20566032447 has 8 divisors (see below), whose sum is σ = 27428151856. Its totient is φ = 13707300672.

The previous prime is 20566032437. The next prime is 20566032469. The reversal of 20566032447 is 74423066502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20566032447 - 2²⁷ = 20431814719 is a prime.

It is a super-2 number, since 2×20566032447² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20566032407) 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 in 7 ways as a sum of consecutive naturals, for example, 832708 + ... + 857049.

It is an arithmetic number, because the mean of its divisors is an integer number (3428518982).

Almost surely, 2^20566032447 is an apocalyptic number.

20566032447 is a deficient number, since it is larger than the sum of its proper divisors (6862119409).

20566032447 is a wasteful number, since it uses less digits than its factorization.

20566032447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693817.

The product of its (nonzero) digits is 241920, while the sum is 39.

Adding to 20566032447 its reverse (74423066502), we get a palindrome (94989098949).

The spelling of 20566032447 in words is "twenty billion, five hundred sixty-six million, thirty-two thousand, four hundred forty-seven".