20666860830 has 576 divisors, whose sum is σ = 73139189760. Its totient is φ = 4147718400.

The previous prime is 20666860829. The next prime is 20666860889. The reversal of 20666860830 is 3806866602.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 40602616 + ... + 40603124.

It is an arithmetic number, because the mean of its divisors is an integer number (126977760).

Almost surely, 2^20666860830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20666860830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36569594880).

20666860830 is an abundant number, since it is smaller than the sum of its proper divisors (52472328930).

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

20666860830 is a wasteful number, since it uses less digits than its factorization.

20666860830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 20666860830 in words is "twenty billion, six hundred sixty-six million, eight hundred sixty thousand, eight hundred thirty".