4020013 has 4 divisors (see below), whose sum is σ = 4128700. Its totient is φ = 3911328.

The previous prime is 4020011. The next prime is 4020017. The reversal of 4020013 is 3100204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2965284 + 1054729 = 1722^2 + 1027^2 .

It is a cyclic number.

It is not a de Polignac number, because 4020013 - 2¹ = 4020011 is a prime.

It is a Duffinian number.

4020013 is a lucky number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 54288 + ... + 54361.

It is an arithmetic number, because the mean of its divisors is an integer number (1032175).

Almost surely, 2^4020013 is an apocalyptic number.

It is an amenable number.

4020013 is a deficient number, since it is larger than the sum of its proper divisors (108687).

4020013 is a wasteful number, since it uses less digits than its factorization.

4020013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108686.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 4020013 is about 2004.9970074791. The cubic root of 4020013 is about 159.0044037123.

Adding to 4020013 its reverse (3100204), we get a palindrome (7120217).

The spelling of 4020013 in words is "four million, twenty thousand, thirteen".