42020440 has 96 divisors (see below), whose sum is σ = 120042000. Its totient is φ = 13090560.

The previous prime is 42020437. The next prime is 42020441. The reversal of 42020440 is 4402024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42020441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20586 + ... + 22534.

Almost surely, 2^42020440 is an apocalyptic number.

42020440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42020440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60021000).

42020440 is an abundant number, since it is smaller than the sum of its proper divisors (78021560).

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

42020440 is a wasteful number, since it uses less digits than its factorization.

42020440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1985 (or 1974 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 42020440 is about 6482.3174868252. The cubic root of 42020440 is about 347.6590442203.

Adding to 42020440 its reverse (4402024), we get a palindrome (46422464).

The spelling of 42020440 in words is "forty-two million, twenty thousand, four hundred forty".