20565013 has 8 divisors (see below), whose sum is σ = 24524928. Its totient is φ = 16860624.

The previous prime is 20565001. The next prime is 20565073. The reversal of 20565013 is 31056502.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20565013 - 2¹³ = 20556821 is a prime.

It is a super-4 number, since 4×20565013⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20565073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63706 + ... + 64027.

It is an arithmetic number, because the mean of its divisors is an integer number (3065616).

Almost surely, 2^20565013 is an apocalyptic number.

20565013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20565013 is a deficient number, since it is larger than the sum of its proper divisors (3959915).

20565013 is a wasteful number, since it uses less digits than its factorization.

20565013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127763.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 20565013 is about 4534.8663706883. The cubic root of 20565013 is about 273.9741970480.

The spelling of 20565013 in words is "twenty million, five hundred sixty-five thousand, thirteen".