20547217604146 has 8 divisors (see below), whose sum is σ = 31343213294640. Its totient is φ = 10099479839268.

The previous prime is 20547217604143. The next prime is 20547217604149. The reversal of 20547217604146 is 64140671274502.

It is an interprime number because it is at equal distance from previous prime (20547217604143) and next prime (20547217604149).

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

It is a self number, because there is not a number n which added to its sum of digits gives 20547217604146.

It is not an unprimeable number, because it can be changed into a prime (20547217604143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87064481256 + ... + 87064481491.

It is an arithmetic number, because the mean of its divisors is an integer number (3917901661830).

Almost surely, 2^{20547217604146} is an apocalyptic number.

20547217604146 is a deficient number, since it is larger than the sum of its proper divisors (10795995690494).

20547217604146 is a wasteful number, since it uses less digits than its factorization.

20547217604146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174128962808.

The product of its (nonzero) digits is 2257920, while the sum is 49.

Adding to 20547217604146 its reverse (64140671274502), we get a palindrome (84687888878648).

The spelling of 20547217604146 in words is "twenty trillion, five hundred forty-seven billion, two hundred seventeen million, six hundred four thousand, one hundred forty-six".