20843946 has 32 divisors (see below), whose sum is σ = 47200320. Its totient is φ = 6815952.

The previous prime is 20843939. The next prime is 20843959. The reversal of 20843946 is 64934802.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20843946.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 780 + ... + 6503.

It is an arithmetic number, because the mean of its divisors is an integer number (1475010).

Almost surely, 2^20843946 is an apocalyptic number.

20843946 is an abundant number, since it is smaller than the sum of its proper divisors (26356374).

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

20843946 is a wasteful number, since it uses less digits than its factorization.

20843946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7347 (or 7341 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 20843946 is about 4565.5170572455. The cubic root of 20843946 is about 275.2073191474.

The spelling of 20843946 in words is "twenty million, eight hundred forty-three thousand, nine hundred forty-six".