20304870 has 16 divisors (see below), whose sum is σ = 48731760. Its totient is φ = 5414624.

The previous prime is 20304839. The next prime is 20304899. The reversal of 20304870 is 7840302.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20304870.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338385 + ... + 338444.

It is an arithmetic number, because the mean of its divisors is an integer number (3045735).

Almost surely, 2^20304870 is an apocalyptic number.

20304870 is an abundant number, since it is smaller than the sum of its proper divisors (28426890).

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

20304870 is a wasteful number, since it uses less digits than its factorization.

20304870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676839.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20304870 is about 4506.0925423253. The cubic root of 20304870 is about 272.8140530911.

The spelling of 20304870 in words is "twenty million, three hundred four thousand, eight hundred seventy".