42550020 has 72 divisors (see below), whose sum is σ = 130452504. Its totient is φ = 11225088.

The previous prime is 42550019. The next prime is 42550051. The reversal of 42550020 is 2005524.

It can be written as a sum of positive squares in 4 ways, for example, as 12278016 + 30272004 = 3504^2 + 5502^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 42549975 and 42550002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16242 + ... + 18678.

Almost surely, 2^42550020 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 42550020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65226252).

42550020 is an abundant number, since it is smaller than the sum of its proper divisors (87902484).

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

42550020 is a wasteful number, since it uses less digits than its factorization.

42550020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2549 (or 2544 counting only the distinct ones).

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

The square root of 42550020 is about 6523.0376359485. The cubic root of 42550020 is about 349.1134569805.

Adding to 42550020 its reverse (2005524), we get a palindrome (44555544).

The spelling of 42550020 in words is "forty-two million, five hundred fifty thousand, twenty".