20531501002505 has 8 divisors (see below), whose sum is σ = 24754568034624. Its totient is φ = 16347356247600.

The previous prime is 20531501002469. The next prime is 20531501002511. The reversal of 20531501002505 is 50520010513502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20531501002505 - 2²⁰ = 20531499953929 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9730568141 + ... + 9730570250.

It is an arithmetic number, because the mean of its divisors is an integer number (3094321004328).

Almost surely, 2^{20531501002505} is an apocalyptic number.

It is an amenable number.

20531501002505 is a deficient number, since it is larger than the sum of its proper divisors (4223067032119).

20531501002505 is a wasteful number, since it uses less digits than its factorization.

20531501002505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19461138607.

The product of its (nonzero) digits is 7500, while the sum is 29.

The spelling of 20531501002505 in words is "twenty trillion, five hundred thirty-one billion, five hundred one million, two thousand, five hundred five".