20713257066 has 8 divisors (see below), whose sum is σ = 41426514144. Its totient is φ = 6904419020.

The previous prime is 20713257001. The next prime is 20713257077. The reversal of 20713257066 is 66075231702.

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

20713257066 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1726104750 + ... + 1726104761.

It is an arithmetic number, because the mean of its divisors is an integer number (5178314268).

Almost surely, 2^20713257066 is an apocalyptic number.

20713257066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20713257066 is a wasteful number, since it uses less digits than its factorization.

20713257066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3452209516.

The product of its (nonzero) digits is 105840, while the sum is 39.

Adding to 20713257066 its reverse (66075231702), we get a palindrome (86788488768).

The spelling of 20713257066 in words is "twenty billion, seven hundred thirteen million, two hundred fifty-seven thousand, sixty-six".