42020705 has 4 divisors (see below), whose sum is σ = 50424852. Its totient is φ = 33616560.

The previous prime is 42020687. The next prime is 42020729. The reversal of 42020705 is 50702024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13845841 + 28174864 = 3721^2 + 5308^2 .

It is not a de Polignac number, because 42020705 - 2¹⁴ = 42004321 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 4202066 + ... + 4202075.

It is an arithmetic number, because the mean of its divisors is an integer number (12606213).

Almost surely, 2^42020705 is an apocalyptic number.

It is an amenable number.

42020705 is a deficient number, since it is larger than the sum of its proper divisors (8404147).

42020705 is an equidigital number, since it uses as much as digits as its factorization.

42020705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8404146.

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 42020705 is about 6482.3379270137. The cubic root of 42020705 is about 347.6597750507.

Adding to 42020705 its reverse (50702024), we get a palindrome (92722729).

The spelling of 42020705 in words is "forty-two million, twenty thousand, seven hundred five".