20515303100 has 72 divisors (see below), whose sum is σ = 46905331200. Its totient is φ = 7773036480.

The previous prime is 20515303093. The next prime is 20515303103. The reversal of 20515303100 is 130351502.

It is a super-2 number, since 2×20515303100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20515303103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 193601 + ... + 280199.

Almost surely, 2^20515303100 is an apocalyptic number.

20515303100 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 20515303100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23452665600).

20515303100 is an abundant number, since it is smaller than the sum of its proper divisors (26390028100).

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

20515303100 is a wasteful number, since it uses less digits than its factorization.

20515303100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86739 (or 86732 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 20.

Adding to 20515303100 its reverse (130351502), we get a palindrome (20645654602).

The spelling of 20515303100 in words is "twenty billion, five hundred fifteen million, three hundred three thousand, one hundred".