20788309206 has 128 divisors (see below), whose sum is σ = 55997568000. Its totient is φ = 5580513792.

The previous prime is 20788309183. The next prime is 20788309211. The reversal of 20788309206 is 60290388702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4232280 + ... + 4237188.

It is an arithmetic number, because the mean of its divisors is an integer number (437481000).

Almost surely, 2^20788309206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20788309206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27998784000).

20788309206 is an abundant number, since it is smaller than the sum of its proper divisors (35209258794).

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

20788309206 is a wasteful number, since it uses less digits than its factorization.

20788309206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603 (or 5597 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 20788309206 in words is "twenty billion, seven hundred eighty-eight million, three hundred nine thousand, two hundred six".