20303040 has 56 divisors (see below), whose sum is σ = 64465200. Its totient is φ = 5413888.

The previous prime is 20303033. The next prime is 20303069. The reversal of 20303040 is 4030302.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 9615 + ... + 11534.

Almost surely, 2^20303040 is an apocalyptic number.

20303040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20303040 is an abundant number, since it is smaller than the sum of its proper divisors (44162160).

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

20303040 is a wasteful number, since it uses less digits than its factorization.

20303040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21169 (or 21159 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 12.

The square root of 20303040 is about 4505.8894793370. The cubic root of 20303040 is about 272.8058569504.

Adding to 20303040 its reverse (4030302), we get a palindrome (24333342).

The spelling of 20303040 in words is "twenty million, three hundred three thousand, forty".