20302240 has 48 divisors (see below), whose sum is σ = 54819072. Its totient is φ = 6960384.

The previous prime is 20302223. The next prime is 20302259. The reversal of 20302240 is 4220302.

It is a self number, because there is not a number n which added to its sum of digits gives 20302240.

It is a congruent number.

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, 7944 + ... + 10183.

It is an arithmetic number, because the mean of its divisors is an integer number (1142064).

Almost surely, 2^20302240 is an apocalyptic number.

20302240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20302240 is an abundant number, since it is smaller than the sum of its proper divisors (34516832).

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

20302240 is a wasteful number, since it uses less digits than its factorization.

20302240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18149 (or 18141 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 20302240 is about 4505.8007057570. The cubic root of 20302240 is about 272.8022737833.

Adding to 20302240 its reverse (4220302), we get a palindrome (24522542).

The spelling of 20302240 in words is "twenty million, three hundred two thousand, two hundred forty".