4020081 has 8 divisors (see below), whose sum is σ = 5772480. Its totient is φ = 2473872.

The previous prime is 4020031. The next prime is 4020119. The reversal of 4020081 is 1800204.

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

It is not a de Polignac number, because 4020081 - 2⁶ = 4020017 is a prime.

It is a super-2 number, since 2×4020081² = 32322102493122, which contains 22 as substring.

4020081 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4020081.

It is not an unprimeable number, because it can be changed into a prime (4020011) 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, 51501 + ... + 51578.

It is an arithmetic number, because the mean of its divisors is an integer number (721560).

Almost surely, 2^4020081 is an apocalyptic number.

It is an amenable number.

4020081 is a deficient number, since it is larger than the sum of its proper divisors (1752399).

4020081 is a wasteful number, since it uses less digits than its factorization.

4020081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103095.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 4020081 is about 2005.0139650386. The cubic root of 4020081 is about 159.0053002466.

Adding to 4020081 its reverse (1800204), we get a palindrome (5820285).

The spelling of 4020081 in words is "four million, twenty thousand, eighty-one".