42543220 has 24 divisors (see below), whose sum is σ = 90229608. Its totient is φ = 16848000.

The previous prime is 42543187. The next prime is 42543269. The reversal of 42543220 is 2234524.

It can be written as a sum of positive squares in 4 ways, for example, as 28793956 + 13749264 = 5366^2 + 3708^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42543191 and 42543200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8511 + ... + 12550.

It is an arithmetic number, because the mean of its divisors is an integer number (3759567).

Almost surely, 2^42543220 is an apocalyptic number.

It is an amenable number.

42543220 is an abundant number, since it is smaller than the sum of its proper divisors (47686388).

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

42543220 is a wasteful number, since it uses less digits than its factorization.

42543220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21171 (or 21169 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 42543220 is about 6522.5163855678. The cubic root of 42543220 is about 349.0948584935.

Adding to 42543220 its reverse (2234524), we get a palindrome (44777744).

The spelling of 42543220 in words is "forty-two million, five hundred forty-three thousand, two hundred twenty".