20515531531232 has 24 divisors (see below), whose sum is σ = 40392017700552. Its totient is φ = 10257241321600.

The previous prime is 20515531531223. The next prime is 20515531531283. The reversal of 20515531531232 is 23213513551502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15752819 + ... + 17005362.

It is an arithmetic number, because the mean of its divisors is an integer number (1683000737523).

Almost surely, 2^{20515531531232} is an apocalyptic number.

It is an amenable number.

20515531531232 is a deficient number, since it is larger than the sum of its proper divisors (19876486169320).

20515531531232 is a wasteful number, since it uses less digits than its factorization.

20515531531232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32777762 (or 32777754 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 38.

The spelling of 20515531531232 in words is "twenty trillion, five hundred fifteen billion, five hundred thirty-one million, five hundred thirty-one thousand, two hundred thirty-two".