20303920 has 80 divisors (see below), whose sum is σ = 58121280. Its totient is φ = 6423552.

The previous prime is 20303909. The next prime is 20303923. The reversal of 20303920 is 2930302.

20303920 = 781² + 782² + ... + 812².

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (20303923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5886 + ... + 8674.

It is an arithmetic number, because the mean of its divisors is an integer number (726516).

Almost surely, 2^20303920 is an apocalyptic number.

20303920 is a gapful number since it is divisible by the number (20) 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 20303920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29060640).

20303920 is an abundant number, since it is smaller than the sum of its proper divisors (37817360).

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

20303920 is a wasteful number, since it uses less digits than its factorization.

20303920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2822 (or 2816 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 20303920 is about 4505.9871282550. The cubic root of 20303920 is about 272.8097983254.

The spelling of 20303920 in words is "twenty million, three hundred three thousand, nine hundred twenty".