20420304 has 20 divisors (see below), whose sum is σ = 52752576. Its totient is φ = 6806752.

The previous prime is 20420303. The next prime is 20420311. The reversal of 20420304 is 40302402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420303) 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 3 ways as a sum of consecutive naturals, for example, 212664 + ... + 212759.

Almost surely, 2^20420304 is an apocalyptic number.

20420304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20420304 is an abundant number, since it is smaller than the sum of its proper divisors (32332272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20420304 is a wasteful number, since it uses less digits than its factorization.

20420304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425434 (or 425428 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 20420304 is about 4518.8830478338. The cubic root of 20420304 is about 273.3300627542.

Adding to 20420304 its reverse (40302402), we get a palindrome (60722706).

The spelling of 20420304 in words is "twenty million, four hundred twenty thousand, three hundred four".