20015348500 has 144 divisors (see below), whose sum is σ = 51056263440. Its totient is φ = 6834643200.

The previous prime is 20015348461. The next prime is 20015348501. The reversal of 20015348500 is 584351002.

It can be written as a sum of positive squares in 8 ways, for example, as 7851023236 + 12164325264 = 88606^2 + 110292^2 .

It is a super-2 number, since 2×20015348500² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20015348501) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6588982 + ... + 6592018.

It is an arithmetic number, because the mean of its divisors is an integer number (354557385).

Almost surely, 2^20015348500 is an apocalyptic number.

20015348500 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 20015348500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25528131720).

20015348500 is an abundant number, since it is smaller than the sum of its proper divisors (31040914940).

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

20015348500 is a wasteful number, since it uses less digits than its factorization.

20015348500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3339 (or 3320 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 20015348500 its reverse (584351002), we get a palindrome (20599699502).

The spelling of 20015348500 in words is "twenty billion, fifteen million, three hundred forty-eight thousand, five hundred".