4020856 has 32 divisors (see below), whose sum is σ = 9072000. Its totient is φ = 1632096.

The previous prime is 4020847. The next prime is 4020869. The reversal of 4020856 is 6580204.

4020856 = T₂₃ + T₂₄ + ... + T₂₈₈.

It is a self number, because there is not a number n which added to its sum of digits gives 4020856.

It is a congruent number.

It is an unprimeable number.

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, 826 + ... + 2953.

It is an arithmetic number, because the mean of its divisors is an integer number (283500).

Almost surely, 2^4020856 is an apocalyptic number.

It is an amenable number.

4020856 is an abundant number, since it is smaller than the sum of its proper divisors (5051144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4020856 is a wasteful number, since it uses less digits than its factorization.

4020856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3811 (or 3807 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 4020856 is about 2005.2072212118. The cubic root of 4020856 is about 159.0155173864.

The spelling of 4020856 in words is "four million, twenty thousand, eight hundred fifty-six".