20531031552 has 160 divisors (see below), whose sum is σ = 63972691200. Its totient is φ = 6483400704.

The previous prime is 20531031551. The next prime is 20531031611. The reversal of 20531031552 is 25513013502.

It is a happy number.

20531031552 is a `hidden beast` number, since 2 + 0 + 5 + 3 + 103 + 1 + 552 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531031551) by changing a digit.

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, 223573 + ... + 301739.

It is an arithmetic number, because the mean of its divisors is an integer number (399829320).

Almost surely, 2^20531031552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20531031552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31986345600).

20531031552 is an abundant number, since it is smaller than the sum of its proper divisors (43441659648).

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

20531031552 is an equidigital number, since it uses as much as digits as its factorization.

20531031552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78213 (or 78191 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The spelling of 20531031552 in words is "twenty billion, five hundred thirty-one million, thirty-one thousand, five hundred fifty-two".