20321542647 has 12 divisors (see below), whose sum is σ = 33546673680. Its totient is φ = 11612310048.

The previous prime is 20321542541. The next prime is 20321542651. The reversal of 20321542647 is 74624512302.

20321542647 is a `hidden beast` number, since 2 + 0 + 3 + 2 + 1 + 5 + 4 + 2 + 647 = 666.

It is not a de Polignac number, because 20321542647 - 2²⁰ = 20320494071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321540647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161282022 + ... + 161282147.

It is an arithmetic number, because the mean of its divisors is an integer number (2795556140).

Almost surely, 2^20321542647 is an apocalyptic number.

20321542647 is a deficient number, since it is larger than the sum of its proper divisors (13225131033).

20321542647 is a wasteful number, since it uses less digits than its factorization.

20321542647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322564182 (or 322564179 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The spelling of 20321542647 in words is "twenty billion, three hundred twenty-one million, five hundred forty-two thousand, six hundred forty-seven".