42561020 has 12 divisors (see below), whose sum is σ = 89378184. Its totient is φ = 17024400.

The previous prime is 42560977. The next prime is 42561031. The reversal of 42561020 is 2016524.

It is a happy number.

It is a super-2 number, since 2×42561020² = 3622880846880800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 2128051 = 42561020 / (4 + 2 + 5 + 6 + 1 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 42560983 and 42561001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1064006 + ... + 1064045.

It is an arithmetic number, because the mean of its divisors is an integer number (7448182).

Almost surely, 2^42561020 is an apocalyptic number.

It is an amenable number.

42561020 is an abundant number, since it is smaller than the sum of its proper divisors (46817164).

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

42561020 is a wasteful number, since it uses less digits than its factorization.

42561020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2128060 (or 2128058 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 42561020 is about 6523.8807469174. The cubic root of 42561020 is about 349.1435385735.

Adding to 42561020 its reverse (2016524), we get a palindrome (44577544).

The spelling of 42561020 in words is "forty-two million, five hundred sixty-one thousand, twenty".