42345020 has 24 divisors (see below), whose sum is σ = 91329504. Its totient is φ = 16479936.

The previous prime is 42345019. The next prime is 42345029. The reversal of 42345020 is 2054324.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 42344983 and 42345001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42345029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27872 + ... + 29351.

It is an arithmetic number, because the mean of its divisors is an integer number (3805396).

Almost surely, 2^42345020 is an apocalyptic number.

It is an amenable number.

42345020 is an abundant number, since it is smaller than the sum of its proper divisors (48984484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42345020 is a wasteful number, since it uses less digits than its factorization.

42345020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57269 (or 57267 counting only the distinct ones).

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

The square root of 42345020 is about 6507.3051257798. The cubic root of 42345020 is about 348.5518943571.

Adding to 42345020 its reverse (2054324), we get a palindrome (44399344).

The spelling of 42345020 in words is "forty-two million, three hundred forty-five thousand, twenty".