4020513681 has 8 divisors (see below), whose sum is σ = 5362917984. Its totient is φ = 2679225920.

The previous prime is 4020513613. The next prime is 4020513713. The reversal of 4020513681 is 1863150204.

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 4020513681 - 2¹⁷ = 4020382609 is a prime.

It is a super-2 number, since 2×4020513681² = 32329060518216339522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4020513611) 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 7 ways as a sum of consecutive naturals, for example, 270696 + ... + 285161.

It is an arithmetic number, because the mean of its divisors is an integer number (670364748).

Almost surely, 2^4020513681 is an apocalyptic number.

It is an amenable number.

4020513681 is a deficient number, since it is larger than the sum of its proper divisors (1342404303).

4020513681 is a wasteful number, since it uses less digits than its factorization.

4020513681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558271.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 4020513681 is about 63407.5206974693. The cubic root of 4020513681 is about 1590.1100461787.

Adding to 4020513681 its reverse (1863150204), we get a palindrome (5883663885).

The spelling of 4020513681 in words is "four billion, twenty million, five hundred thirteen thousand, six hundred eighty-one".