20455352531520 has 112 divisors (see below), whose sum is σ = 64949654289408. Its totient is φ = 5454432276480.

The previous prime is 20455352531501. The next prime is 20455352531533. The reversal of 20455352531520 is 2513525355402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15524772 + ... + 16790748.

It is an arithmetic number, because the mean of its divisors is an integer number (579907627584).

Almost surely, 2^{20455352531520} is an apocalyptic number.

20455352531520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20455352531520 is an abundant number, since it is smaller than the sum of its proper divisors (44494301757888).

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

20455352531520 is a wasteful number, since it uses less digits than its factorization.

20455352531520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282828 (or 1282818 counting only the distinct ones).

The product of its (nonzero) digits is 900000, while the sum is 42.

Adding to 20455352531520 its reverse (2513525355402), we get a palindrome (22968877886922).

The spelling of 20455352531520 in words is "twenty trillion, four hundred fifty-five billion, three hundred fifty-two million, five hundred thirty-one thousand, five hundred twenty".