4020681 has 8 divisors (see below), whose sum is σ = 6126784. Its totient is φ = 2297520.

The previous prime is 4020671. The next prime is 4020691. The reversal of 4020681 is 1860204.

It is an interprime number because it is at equal distance from previous prime (4020671) and next prime (4020691).

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

It is not a de Polignac number, because 4020681 - 2⁶ = 4020617 is a prime.

It is a super-2 number, since 2×4020681² = 32331751407522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 191461 = 4020681 / (4 + 0 + 2 + 0 + 6 + 8 + 1).

It is a Duffinian number.

4020681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4020631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95710 + ... + 95751.

It is an arithmetic number, because the mean of its divisors is an integer number (765848).

Almost surely, 2^4020681 is an apocalyptic number.

It is an amenable number.

4020681 is a deficient number, since it is larger than the sum of its proper divisors (2106103).

4020681 is a wasteful number, since it uses less digits than its factorization.

4020681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191471.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 4020681 is about 2005.1635843492. The cubic root of 4020681 is about 159.0132104051.

Adding to 4020681 its reverse (1860204), we get a palindrome (5880885).

The spelling of 4020681 in words is "four million, twenty thousand, six hundred eighty-one".