243340020 has 288 divisors, whose sum is σ = 934891776. Its totient is φ = 49766400.

The previous prime is 243340003. The next prime is 243340021. The reversal of 243340020 is 20043342.

243340020 is a `hidden beast` number, since 243 + 3 + 400 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 243339975 and 243340002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243340021) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1344330 + ... + 1344510.

It is an arithmetic number, because the mean of its divisors is an integer number (3246152).

Almost surely, 2^243340020 is an apocalyptic number.

243340020 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 243340020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (467445888).

243340020 is an abundant number, since it is smaller than the sum of its proper divisors (691551756).

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

243340020 is a wasteful number, since it uses less digits than its factorization.

243340020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 243340020 is about 15599.3596022401. The cubic root of 243340020 is about 624.3160689209.

Adding to 243340020 its reverse (20043342), we get a palindrome (263383362).

The spelling of 243340020 in words is "two hundred forty-three million, three hundred forty thousand, twenty".