20477641565 has 8 divisors (see below), whose sum is σ = 24666605568. Its totient is φ = 16319822800.

The previous prime is 20477641549. The next prime is 20477641603. The reversal of 20477641565 is 56514677402.

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

It is not a de Polignac number, because 20477641565 - 2⁴ = 20477641549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7784861 + ... + 7787490.

It is an arithmetic number, because the mean of its divisors is an integer number (3083325696).

Almost surely, 2^20477641565 is an apocalyptic number.

It is an amenable number.

20477641565 is a deficient number, since it is larger than the sum of its proper divisors (4188964003).

20477641565 is a wasteful number, since it uses less digits than its factorization.

20477641565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15572619.

The product of its (nonzero) digits is 1411200, while the sum is 47.

The spelling of 20477641565 in words is "twenty billion, four hundred seventy-seven million, six hundred forty-one thousand, five hundred sixty-five".