20321100500 has 24 divisors (see below), whose sum is σ = 44381284584. Its totient is φ = 8128440000.

The previous prime is 20321100497. The next prime is 20321100511. The reversal of 20321100500 is 500112302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 689167504 + 19631932996 = 26252^2 + 140114^2 .

It is a super-2 number, since 2×20321100500² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20320601 + ... + 20321600.

It is an arithmetic number, because the mean of its divisors is an integer number (1849220191).

Almost surely, 2^20321100500 is an apocalyptic number.

20321100500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20321100500 is an abundant number, since it is smaller than the sum of its proper divisors (24060184084).

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

20321100500 is a wasteful number, since it uses less digits than its factorization.

20321100500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40642220 (or 40642208 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

Adding to 20321100500 its reverse (500112302), we get a palindrome (20821212802).

The spelling of 20321100500 in words is "twenty billion, three hundred twenty-one million, one hundred thousand, five hundred".