42020345 has 32 divisors (see below), whose sum is σ = 56733696. Its totient is φ = 29721600.

The previous prime is 42020339. The next prime is 42020347. The reversal of 42020345 is 54302024.

42020345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42020345 - 2⁶ = 42020281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42020347) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 97280 + ... + 97710.

It is an arithmetic number, because the mean of its divisors is an integer number (1772928).

Almost surely, 2^42020345 is an apocalyptic number.

It is an amenable number.

42020345 is a deficient number, since it is larger than the sum of its proper divisors (14713351).

42020345 is a wasteful number, since it uses less digits than its factorization.

42020345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 42020345 is about 6482.3101591948. The cubic root of 42020345 is about 347.6587822237.

Adding to 42020345 its reverse (54302024), we get a palindrome (96322369).

The spelling of 42020345 in words is "forty-two million, twenty thousand, three hundred forty-five".