420531005 has 4 divisors (see below), whose sum is σ = 504637212. Its totient is φ = 336424800.

The previous prime is 420530993. The next prime is 420531019. The reversal of 420531005 is 500135024.

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 147719716 + 272811289 = 12154^2 + 16517^2 .

It is a de Polignac number, because none of the positive numbers 2^k-420531005 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42053096 + ... + 42053105.

It is an arithmetic number, because the mean of its divisors is an integer number (126159303).

Almost surely, 2^420531005 is an apocalyptic number.

It is an amenable number.

420531005 is a deficient number, since it is larger than the sum of its proper divisors (84106207).

420531005 is an equidigital number, since it uses as much as digits as its factorization.

420531005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84106206.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 420531005 is about 20506.8526351559. The cubic root of 420531005 is about 749.2027112597.

Adding to 420531005 its reverse (500135024), we get a palindrome (920666029).

The spelling of 420531005 in words is "four hundred twenty million, five hundred thirty-one thousand, five".