20340203240 has 64 divisors (see below), whose sum is σ = 52421765760. Its totient is φ = 6957999360.

The previous prime is 20340203239. The next prime is 20340203263. The reversal of 20340203240 is 4230204302.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42050 + ... + 206030.

It is an arithmetic number, because the mean of its divisors is an integer number (819090090).

Almost surely, 2^20340203240 is an apocalyptic number.

20340203240 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 20340203240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26210882880).

20340203240 is an abundant number, since it is smaller than the sum of its proper divisors (32081562520).

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

20340203240 is a wasteful number, since it uses less digits than its factorization.

20340203240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164442 (or 164438 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

Adding to 20340203240 its reverse (4230204302), we get a palindrome (24570407542).

The spelling of 20340203240 in words is "twenty billion, three hundred forty million, two hundred three thousand, two hundred forty".