4020023565 has 24 divisors (see below), whose sum is σ = 7035699840. Its totient is φ = 2123194464.

The previous prime is 4020023563. The next prime is 4020023573. The reversal of 4020023565 is 5653200204.

It is not a de Polignac number, because 4020023565 - 2¹ = 4020023563 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4020023563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 429025 + ... + 438294.

It is an arithmetic number, because the mean of its divisors is an integer number (293154160).

Almost surely, 2^4020023565 is an apocalyptic number.

4020023565 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4020023565 is a deficient number, since it is larger than the sum of its proper divisors (3015676275).

4020023565 is a wasteful number, since it uses less digits than its factorization.

4020023565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867433 (or 867430 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 4020023565 is about 63403.6557699948. The cubic root of 4020023565 is about 1590.0454300536.

Adding to 4020023565 its reverse (5653200204), we get a palindrome (9673223769).

The spelling of 4020023565 in words is "four billion, twenty million, twenty-three thousand, five hundred sixty-five".