42240220 has 48 divisors (see below), whose sum is σ = 97778016. Its totient is φ = 15200000.

The previous prime is 42240181. The next prime is 42240221. The reversal of 42240220 is 2204224.

It is a junction number, because it is equal to n+sod(n) for n = 42240194 and 42240203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42240221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21270 + ... + 23170.

It is an arithmetic number, because the mean of its divisors is an integer number (2037042).

Almost surely, 2^42240220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42240220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48889008).

42240220 is an abundant number, since it is smaller than the sum of its proper divisors (55537796).

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

42240220 is a wasteful number, since it uses less digits than its factorization.

42240220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022 (or 2020 counting only the distinct ones).

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

The square root of 42240220 is about 6499.2476487667. The cubic root of 42240220 is about 348.2641122700.

Adding to 42240220 its reverse (2204224), we get a palindrome (44444444).

The spelling of 42240220 in words is "forty-two million, two hundred forty thousand, two hundred twenty".