20642304 has 80 divisors (see below), whose sum is σ = 55978560. Its totient is φ = 6758400.

The previous prime is 20642299. The next prime is 20642351. The reversal of 20642304 is 40324602.

It is a super-2 number, since 2×20642304² = 852209428856832, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 136629 + ... + 136779.

It is an arithmetic number, because the mean of its divisors is an integer number (699732).

Almost surely, 2^20642304 is an apocalyptic number.

20642304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20642304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27989280).

20642304 is an abundant number, since it is smaller than the sum of its proper divisors (35336256).

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

20642304 is an equidigital number, since it uses as much as digits as its factorization.

20642304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 20642304 is about 4543.3802394253. The cubic root of 20642304 is about 274.3170003995.

Adding to 20642304 its reverse (40324602), we get a palindrome (60966906).

The spelling of 20642304 in words is "twenty million, six hundred forty-two thousand, three hundred four".