20208842647 has 8 divisors (see below), whose sum is σ = 23892228000. Its totient is φ = 16724559264.

The previous prime is 20208842629. The next prime is 20208842657. The reversal of 20208842647 is 74624880202.

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

It is not a de Polignac number, because 20208842647 - 2¹¹ = 20208840599 is a prime.

It is a super-2 number, since 2×20208842647² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20208842617) 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, 49775272 + ... + 49775677.

It is an arithmetic number, because the mean of its divisors is an integer number (2986528500).

Almost surely, 2^20208842647 is an apocalyptic number.

20208842647 is a deficient number, since it is larger than the sum of its proper divisors (3683385353).

20208842647 is an equidigital number, since it uses as much as digits as its factorization.

20208842647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99550985.

The product of its (nonzero) digits is 344064, while the sum is 43.

The spelling of 20208842647 in words is "twenty billion, two hundred eight million, eight hundred forty-two thousand, six hundred forty-seven".