20843340 has 48 divisors (see below), whose sum is σ = 66700032. Its totient is φ = 4764096.

The previous prime is 20843287. The next prime is 20843341. The reversal of 20843340 is 4334802.

It is a self number, because there is not a number n which added to its sum of digits gives 20843340.

It is not an unprimeable number, because it can be changed into a prime (20843341) 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, 24394 + ... + 25233.

It is an arithmetic number, because the mean of its divisors is an integer number (1389584).

Almost surely, 2^20843340 is an apocalyptic number.

20843340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20843340 is an abundant number, since it is smaller than the sum of its proper divisors (45856692).

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

20843340 is a wasteful number, since it uses less digits than its factorization.

20843340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49646 (or 49644 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 20843340 is about 4565.4506896910. The cubic root of 20843340 is about 275.2046520700.

The spelling of 20843340 in words is "twenty million, eight hundred forty-three thousand, three hundred forty".