20209347666944 has 88 divisors (see below), whose sum is σ = 40681879653888. Its totient is φ = 10034106163200.

The previous prime is 20209347666917. The next prime is 20209347666961. The reversal of 20209347666944 is 44966674390202.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105407969 + ... + 105599519.

It is an arithmetic number, because the mean of its divisors is an integer number (462294086976).

Almost surely, 2^{20209347666944} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20209347666944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20340939826944).

20209347666944 is an abundant number, since it is smaller than the sum of its proper divisors (20472531986944).

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

20209347666944 is a wasteful number, since it uses less digits than its factorization.

20209347666944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192291 (or 192273 counting only the distinct ones).

The product of its (nonzero) digits is 94058496, while the sum is 62.

The spelling of 20209347666944 in words is "twenty trillion, two hundred nine billion, three hundred forty-seven million, six hundred sixty-six thousand, nine hundred forty-four".