20065512500 has 72 divisors (see below), whose sum is σ = 47880872928. Its totient is φ = 7296500000.

The previous prime is 20065512499. The next prime is 20065512521. The reversal of 20065512500 is 521556002.

It is a self number, because there is not a number n which added to its sum of digits gives 20065512500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64535 + ... + 210465.

It is an arithmetic number, because the mean of its divisors is an integer number (665012124).

Almost surely, 2^20065512500 is an apocalyptic number.

20065512500 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 20065512500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23940436464).

20065512500 is an abundant number, since it is smaller than the sum of its proper divisors (27815360428).

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

20065512500 is a wasteful number, since it uses less digits than its factorization.

20065512500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145971 (or 145949 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 20065512500 in words is "twenty billion, sixty-five million, five hundred twelve thousand, five hundred".