20566407500 has 120 divisors (see below), whose sum is σ = 48872355840. Its totient is φ = 7541640000.

The previous prime is 20566407479. The next prime is 20566407503. The reversal of 20566407500 is 570466502.

It is not an unprimeable number, because it can be changed into a prime (20566407503) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1465517 + ... + 1479483.

It is an arithmetic number, because the mean of its divisors is an integer number (407269632).

Almost surely, 2^20566407500 is an apocalyptic number.

20566407500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20566407500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24436177920).

20566407500 is an abundant number, since it is smaller than the sum of its proper divisors (28305948340).

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

20566407500 is a wasteful number, since it uses less digits than its factorization.

20566407500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14041 (or 14024 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 35.

The spelling of 20566407500 in words is "twenty billion, five hundred sixty-six million, four hundred seven thousand, five hundred".