20890304 has 28 divisors (see below), whose sum is σ = 42141648. Its totient is φ = 10272000.

The previous prime is 20890301. The next prime is 20890313. The reversal of 20890304 is 40309802.

It is not an unprimeable number, because it can be changed into a prime (20890301) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1229 + ... + 6579.

Almost surely, 2^20890304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20890304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21070824).

20890304 is an abundant number, since it is smaller than the sum of its proper divisors (21251344).

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

20890304 is an equidigital number, since it uses as much as digits as its factorization.

20890304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5424 (or 5414 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20890304 is about 4570.5912090232. The cubic root of 20890304 is about 275.4111931224.

The spelling of 20890304 in words is "twenty million, eight hundred ninety thousand, three hundred four".