20145545331552 has 60 divisors (see below), whose sum is σ = 59247489229236. Its totient is φ = 6715181776320.

The previous prime is 20145545331523. The next prime is 20145545331607. The reversal of 20145545331552 is 25513354554102.

20145545331552 is a `hidden beast` number, since 2 + 0 + 1 + 4 + 5 + 54 + 533 + 15 + 52 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20145545331498 and 20145545331507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3886097974 + ... + 3886103157.

Almost surely, 2^{20145545331552} is an apocalyptic number.

It is an amenable number.

20145545331552 is an abundant number, since it is smaller than the sum of its proper divisors (39101943897684).

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

20145545331552 is an equidigital number, since it uses as much as digits as its factorization.

20145545331552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7772201153 (or 7772201136 counting only the distinct ones).

The product of its (nonzero) digits is 1800000, while the sum is 45.

Adding to 20145545331552 its reverse (25513354554102), we get a palindrome (45658899885654).

The spelling of 20145545331552 in words is "twenty trillion, one hundred forty-five billion, five hundred forty-five million, three hundred thirty-one thousand, five hundred fifty-two".