20843938 has 16 divisors (see below), whose sum is σ = 33312384. Its totient is φ = 9747520.

The previous prime is 20843929. The next prime is 20843939. The reversal of 20843938 is 83934802.

It is a junction number, because it is equal to n+sod(n) for n = 20843897 and 20843906.

It is not an unprimeable number, because it can be changed into a prime (20843939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3843 + ... + 7513.

It is an arithmetic number, because the mean of its divisors is an integer number (2082024).

Almost surely, 2^20843938 is an apocalyptic number.

20843938 is a deficient number, since it is larger than the sum of its proper divisors (12468446).

20843938 is a wasteful number, since it uses less digits than its factorization.

20843938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3857.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 20843938 is about 4565.5161811125. The cubic root of 20843938 is about 275.2072839388.

The spelling of 20843938 in words is "twenty million, eight hundred forty-three thousand, nine hundred thirty-eight".