20303240 has 64 divisors (see below), whose sum is σ = 47608560. Its totient is φ = 7787520.

The previous prime is 20303203. The next prime is 20303249. The reversal of 20303240 is 4230302.

20303240 = T₁₉₁ + T₁₉₂ + ... + T₅₀₄.

It can be written as a sum of positive squares in 8 ways, for example, as 3378244 + 16924996 = 1838^2 + 4114^2 .

It is not an unprimeable number, because it can be changed into a prime (20303249) 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, 129242 + ... + 129398.

Almost surely, 2^20303240 is an apocalyptic number.

20303240 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 20303240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23804280).

20303240 is an abundant number, since it is smaller than the sum of its proper divisors (27305320).

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

20303240 is a wasteful number, since it uses less digits than its factorization.

20303240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 14.

The square root of 20303240 is about 4505.9116724587. The cubic root of 20303240 is about 272.8067527274.

Adding to 20303240 its reverse (4230302), we get a palindrome (24533542).

The spelling of 20303240 in words is "twenty million, three hundred three thousand, two hundred forty".