4020857 has 6 divisors (see below), whose sum is σ = 4271598. Its totient is φ = 3784064.

The previous prime is 4020847. The next prime is 4020869. The reversal of 4020857 is 7580204.

It can be written as a sum of positive squares in 3 ways, for example, as 1915456 + 2105401 = 1384^2 + 1451^2 .

It is not a de Polignac number, because 4020857 - 2¹⁰ = 4019833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4020847) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6668 + ... + 7245.

It is an arithmetic number, because the mean of its divisors is an integer number (711933).

Almost surely, 2^4020857 is an apocalyptic number.

It is an amenable number.

4020857 is a deficient number, since it is larger than the sum of its proper divisors (250741).

4020857 is a wasteful number, since it uses less digits than its factorization.

4020857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13947 (or 13930 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 4020857 is about 2005.2074705626. The cubic root of 4020857 is about 159.0155305690.

The spelling of 4020857 in words is "four million, twenty thousand, eight hundred fifty-seven".