20456565 has 8 divisors (see below), whose sum is σ = 32730528. Its totient is φ = 10910160.

The previous prime is 20456551. The next prime is 20456573. The reversal of 20456565 is 56565402.

It is a happy number.

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

It is not a de Polignac number, because 20456565 - 2⁷ = 20456437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 681871 + ... + 681900.

It is an arithmetic number, because the mean of its divisors is an integer number (4091316).

Almost surely, 2^20456565 is an apocalyptic number.

It is an amenable number.

20456565 is a deficient number, since it is larger than the sum of its proper divisors (12273963).

20456565 is a wasteful number, since it uses less digits than its factorization.

20456565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363779.

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 20456565 is about 4522.8934323064. The cubic root of 20456565 is about 273.4917541215.

The spelling of 20456565 in words is "twenty million, four hundred fifty-six thousand, five hundred sixty-five".