20340340 has 48 divisors (see below), whose sum is σ = 44997120. Its totient is φ = 7712640.

The previous prime is 20340323. The next prime is 20340373. The reversal of 20340340 is 4304302.

It is a congruent number.

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, 32551 + ... + 33169.

It is an arithmetic number, because the mean of its divisors is an integer number (937440).

Almost surely, 2^20340340 is an apocalyptic number.

20340340 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 20340340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22498560).

20340340 is an abundant number, since it is smaller than the sum of its proper divisors (24656780).

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

20340340 is a wasteful number, since it uses less digits than its factorization.

20340340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712 (or 710 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 20340340 is about 4510.0266074603. The cubic root of 20340340 is about 272.9728177170.

Adding to 20340340 its reverse (4304302), we get a palindrome (24644642).

The spelling of 20340340 in words is "twenty million, three hundred forty thousand, three hundred forty".