42020550 has 144 divisors (see below), whose sum is σ = 132835248. Its totient is φ = 9388800.

The previous prime is 42020527. The next prime is 42020557. The reversal of 42020550 is 5502024.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42020557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 64024 + ... + 64676.

It is an arithmetic number, because the mean of its divisors is an integer number (922467).

Almost surely, 2^42020550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42020550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66417624).

42020550 is an abundant number, since it is smaller than the sum of its proper divisors (90814698).

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

42020550 is a wasteful number, since it uses less digits than its factorization.

42020550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695 (or 687 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 42020550 is about 6482.3259714396. The cubic root of 42020550 is about 347.6593475842.

Adding to 42020550 its reverse (5502024), we get a palindrome (47522574).

The spelling of 42020550 in words is "forty-two million, twenty thousand, five hundred fifty".