20520450453231 has 32 divisors (see below), whose sum is σ = 30481266816000. Its totient is φ = 13644075003264.

The previous prime is 20520450453203. The next prime is 20520450453323. The reversal of 20520450453231 is 13235405402502.

20520450453231 is a `hidden beast` number, since 2 + 0 + 52 + 0 + 45 + 0 + 4 + 532 + 31 = 666.

It is not a de Polignac number, because 20520450453231 - 2⁵ = 20520450453199 is a prime.

It is a super-2 number, since 2×20520450453231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520450453031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16018660 + ... + 17252198.

It is an arithmetic number, because the mean of its divisors is an integer number (952539588000).

Almost surely, 2^{20520450453231} is an apocalyptic number.

20520450453231 is a deficient number, since it is larger than the sum of its proper divisors (9960816362769).

20520450453231 is a wasteful number, since it uses less digits than its factorization.

20520450453231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235180 (or 1235174 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

Adding to 20520450453231 its reverse (13235405402502), we get a palindrome (33755855855733).

The spelling of 20520450453231 in words is "twenty trillion, five hundred twenty billion, four hundred fifty million, four hundred fifty-three thousand, two hundred thirty-one".