20647734085 has 8 divisors (see below), whose sum is σ = 27029761056. Its totient is φ = 15016533840.

The previous prime is 20647734067. The next prime is 20647734089. The reversal of 20647734085 is 58043774602.

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

It is not a de Polignac number, because 20647734085 - 2¹¹ = 20647732037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20647734089) 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 7 ways as a sum of consecutive naturals, for example, 187706619 + ... + 187706728.

It is an arithmetic number, because the mean of its divisors is an integer number (3378720132).

Almost surely, 2^20647734085 is an apocalyptic number.

It is an amenable number.

20647734085 is a deficient number, since it is larger than the sum of its proper divisors (6382026971).

20647734085 is a wasteful number, since it uses less digits than its factorization.

20647734085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375413363.

The product of its (nonzero) digits is 1128960, while the sum is 46.

The spelling of 20647734085 in words is "twenty billion, six hundred forty-seven million, seven hundred thirty-four thousand, eighty-five".