4020445 has 16 divisors (see below), whose sum is σ = 5668992. Its totient is φ = 2698560.

The previous prime is 4020433. The next prime is 4020461. The reversal of 4020445 is 5440204.

It is not a de Polignac number, because 4020445 - 2¹¹ = 4018397 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2097 + ... + 3526.

It is an arithmetic number, because the mean of its divisors is an integer number (354312).

Almost surely, 2^4020445 is an apocalyptic number.

It is an amenable number.

4020445 is a deficient number, since it is larger than the sum of its proper divisors (1648547).

4020445 is a wasteful number, since it uses less digits than its factorization.

4020445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5652.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 4020445 is about 2005.1047354191. The cubic root of 4020445 is about 159.0100991700.

Adding to 4020445 its reverse (5440204), we get a palindrome (9460649).

It can be divided in two parts, 4020 and 445, that added together give a triangular number (4465 = T₉₄).

The spelling of 4020445 in words is "four million, twenty thousand, four hundred forty-five".