20420654565 has 32 divisors (see below), whose sum is σ = 32864832000. Its totient is φ = 10827177984.

The previous prime is 20420654561. The next prime is 20420654591. The reversal of 20420654565 is 56545602402.

It is not a de Polignac number, because 20420654565 - 2² = 20420654561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420654561) 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 31 ways as a sum of consecutive naturals, for example, 5905317 + ... + 5908773.

It is an arithmetic number, because the mean of its divisors is an integer number (1027026000).

Almost surely, 2^20420654565 is an apocalyptic number.

It is an amenable number.

20420654565 is a deficient number, since it is larger than the sum of its proper divisors (12444177435).

20420654565 is a wasteful number, since it uses less digits than its factorization.

20420654565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5661.

The product of its (nonzero) digits is 288000, while the sum is 39.

The spelling of 20420654565 in words is "twenty billion, four hundred twenty million, six hundred fifty-four thousand, five hundred sixty-five".