20631720306 has 8 divisors (see below), whose sum is σ = 41263440624. Its totient is φ = 6877240100.

The previous prime is 20631720301. The next prime is 20631720349. The reversal of 20631720306 is 60302713602.

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

20631720306 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20631720301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1719310020 + ... + 1719310031.

It is an arithmetic number, because the mean of its divisors is an integer number (5157930078).

Almost surely, 2^20631720306 is an apocalyptic number.

20631720306 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.

20631720306 is a wasteful number, since it uses less digits than its factorization.

20631720306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3438620056.

The product of its (nonzero) digits is 9072, while the sum is 30.

The spelling of 20631720306 in words is "twenty billion, six hundred thirty-one million, seven hundred twenty thousand, three hundred six".