420431553 has 12 divisors (see below), whose sum is σ = 629782608. Its totient is φ = 280287540.

The previous prime is 420431527. The next prime is 420431587. The reversal of 420431553 is 355134024.

It is not a de Polignac number, because 420431553 - 2⁵ = 420431521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (420431503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 864843 + ... + 865328.

It is an arithmetic number, because the mean of its divisors is an integer number (52481884).

Almost surely, 2^420431553 is an apocalyptic number.

It is an amenable number.

420431553 is a deficient number, since it is larger than the sum of its proper divisors (209351055).

420431553 is an equidigital number, since it uses as much as digits as its factorization.

420431553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730186 (or 1730174 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 420431553 is about 20504.4276438042. The cubic root of 420431553 is about 749.1436465839.

Adding to 420431553 its reverse (355134024), we get a palindrome (775565577).

The spelling of 420431553 in words is "four hundred twenty million, four hundred thirty-one thousand, five hundred fifty-three".