20315100043520 has 72 divisors (see below), whose sum is σ = 48680665811064. Its totient is φ = 8122758152192.

The previous prime is 20315100043501. The next prime is 20315100043543. The reversal of 20315100043520 is 2534000151302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3876551458816 + 16438548584704 = 1968896^2 + 4054448^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20315100043520.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33149 + ... + 6374268.

It is an arithmetic number, because the mean of its divisors is an integer number (676120358487).

Almost surely, 2^{20315100043520} is an apocalyptic number.

20315100043520 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 20315100043520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24340332905532).

20315100043520 is an abundant number, since it is smaller than the sum of its proper divisors (28365565767544).

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

20315100043520 is an equidigital number, since it uses as much as digits as its factorization.

20315100043520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6409915 (or 6409901 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 20315100043520 its reverse (2534000151302), we get a palindrome (22849100194822).

The spelling of 20315100043520 in words is "twenty trillion, three hundred fifteen billion, one hundred million, forty-three thousand, five hundred twenty".