20847120786 has 24 divisors (see below), whose sum is σ = 46726306380. Its totient is φ = 6709418016.

The previous prime is 20847120779. The next prime is 20847120821. The reversal of 20847120786 is 68702174802.

It can be written as a sum of positive squares in 2 ways, for example, as 20716132761 + 130988025 = 143931^2 + 11445^2 .

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 11 ways as a sum of consecutive naturals, for example, 19967985 + ... + 19969028.

Almost surely, 2^20847120786 is an apocalyptic number.

20847120786 is an abundant number, since it is smaller than the sum of its proper divisors (25879185594).

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

20847120786 is a wasteful number, since it uses less digits than its factorization.

20847120786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39937050 (or 39937047 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The spelling of 20847120786 in words is "twenty billion, eight hundred forty-seven million, one hundred twenty thousand, seven hundred eighty-six".