420332005 has 16 divisors (see below), whose sum is σ = 508725360. Its totient is φ = 333394432.

The previous prime is 420331991. The next prime is 420332023. The reversal of 420332005 is 500233024.

It is a Cunningham number, because it is equal to 20502²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 420332004 = 1^2 + 20502^2 .

It is a cyclic number.

It is not a de Polignac number, because 420332005 - 2⁵ = 420331973 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 382617 + ... + 383713.

It is an arithmetic number, because the mean of its divisors is an integer number (31795335).

Almost surely, 2^420332005 is an apocalyptic number.

It is an amenable number.

420332005 is a deficient number, since it is larger than the sum of its proper divisors (88393355).

420332005 is a wasteful number, since it uses less digits than its factorization.

420332005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688.

The product of its (nonzero) digits is 720, while the sum is 19.

The square root of 420332005 is about 20502.0000243879. Note that the first 4 decimals coincide. The cubic root of 420332005 is about 749.0845155649.

Adding to 420332005 its reverse (500233024), we get a palindrome (920565029).

The spelling of 420332005 in words is "four hundred twenty million, three hundred thirty-two thousand, five".