42020405 has 8 divisors (see below), whose sum is σ = 57628032. Its totient is φ = 28813968.

The previous prime is 42020393. The next prime is 42020437. The reversal of 42020405 is 50402024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42020405 - 2²⁰ = 40971829 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 600257 + ... + 600326.

It is an arithmetic number, because the mean of its divisors is an integer number (7203504).

Almost surely, 2^42020405 is an apocalyptic number.

It is an amenable number.

42020405 is a deficient number, since it is larger than the sum of its proper divisors (15607627).

42020405 is a wasteful number, since it uses less digits than its factorization.

42020405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200595.

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 42020405 is about 6482.3147871729. The cubic root of 42020405 is about 347.6589476953.

Adding to 42020405 its reverse (50402024), we get a palindrome (92422429).

The spelling of 42020405 in words is "forty-two million, twenty thousand, four hundred five".