42805820 has 24 divisors (see below), whose sum is σ = 90786528. Its totient is φ = 16952000.

The previous prime is 42805817. The next prime is 42805837. The reversal of 42805820 is 2850824.

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, 8576 + ... + 12615.

It is an arithmetic number, because the mean of its divisors is an integer number (3782772).

Almost surely, 2^42805820 is an apocalyptic number.

It is an amenable number.

42805820 is an abundant number, since it is smaller than the sum of its proper divisors (47980708).

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

42805820 is a wasteful number, since it uses less digits than its factorization.

42805820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21301 (or 21299 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 42805820 is about 6542.6156848771. The cubic root of 42805820 is about 349.8116537651.

The spelling of 42805820 in words is "forty-two million, eight hundred five thousand, eight hundred twenty".