20530044520000 has 140 divisors (see below), whose sum is σ = 50921719068220. Its totient is φ = 8209778688000.

The previous prime is 20530044519997. The next prime is 20530044520003. The reversal of 20530044520000 is 2544003502.

It is an interprime number because it is at equal distance from previous prime (20530044519997) and next prime (20530044520003).

It can be written as a sum of positive squares in 10 ways, for example, as 4857757057024 + 15672287462976 = 2204032^2 + 3958824^2 .

It is a super-3 number, since 3×20530044520000³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (20530044520003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 150691912 + ... + 150828088.

It is an arithmetic number, because the mean of its divisors is an integer number (363726564773).

Almost surely, 2^{20530044520000} is an apocalyptic number.

20530044520000 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 20530044520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25460859534110).

20530044520000 is an abundant number, since it is smaller than the sum of its proper divisors (30391674548220).

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

20530044520000 is an equidigital number, since it uses as much as digits as its factorization.

20530044520000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139978 (or 139953 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 25.

Adding to 20530044520000 its reverse (2544003502), we get a palindrome (20532588523502).

The spelling of 20530044520000 in words is "twenty trillion, five hundred thirty billion, forty-four million, five hundred twenty thousand".