20465112500 has 144 divisors (see below), whose sum is σ = 53389082880. Its totient is φ = 6710880000.

The previous prime is 20465112497. The next prime is 20465112509. The reversal of 20465112500 is 521156402.

It is a self number, because there is not a number n which added to its sum of digits gives 20465112500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20465112509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2007416 + ... + 2017584.

It is an arithmetic number, because the mean of its divisors is an integer number (370757520).

Almost surely, 2^20465112500 is an apocalyptic number.

20465112500 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 20465112500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26694541440).

20465112500 is an abundant number, since it is smaller than the sum of its proper divisors (32923970380).

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

20465112500 is a wasteful number, since it uses less digits than its factorization.

20465112500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10228 (or 10206 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 20465112500 its reverse (521156402), we get a palindrome (20986268902).

The spelling of 20465112500 in words is "twenty billion, four hundred sixty-five million, one hundred twelve thousand, five hundred".