42020545 has 16 divisors (see below), whose sum is σ = 58203648. Its totient is φ = 28526400.

The previous prime is 42020527. The next prime is 42020557. The reversal of 42020545 is 54502024.

It is a de Polignac number, because none of the positive numbers 2^k-42020545 is a prime.

It is a Duffinian 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, 2409 + ... + 9478.

It is an arithmetic number, because the mean of its divisors is an integer number (3637728).

Almost surely, 2^42020545 is an apocalyptic number.

It is an amenable number.

42020545 is a deficient number, since it is larger than the sum of its proper divisors (16183103).

42020545 is a wasteful number, since it uses less digits than its factorization.

42020545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12000.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 42020545 is about 6482.3255857755. The cubic root of 42020545 is about 347.6593337950.

Adding to 42020545 its reverse (54502024), we get a palindrome (96522569).

The spelling of 42020545 in words is "forty-two million, twenty thousand, five hundred forty-five".