20668173834 has 144 divisors (see below), whose sum is σ = 53006837184. Its totient is φ = 5352842880.

The previous prime is 20668173833. The next prime is 20668173847. The reversal of 20668173834 is 43837186602.

It is not an unprimeable number, because it can be changed into a prime (20668173833) 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 71 ways as a sum of consecutive naturals, for example, 17323942 + ... + 17325134.

It is an arithmetic number, because the mean of its divisors is an integer number (368103036).

Almost surely, 2^20668173834 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20668173834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26503418592).

20668173834 is an abundant number, since it is smaller than the sum of its proper divisors (32338663350).

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

20668173834 is a wasteful number, since it uses less digits than its factorization.

20668173834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721 (or 1703 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 48.

The spelling of 20668173834 in words is "twenty billion, six hundred sixty-eight million, one hundred seventy-three thousand, eight hundred thirty-four".