20842841 has 4 divisors (see below), whose sum is σ = 20864052. Its totient is φ = 20821632.

The previous prime is 20842837. The next prime is 20842847. The reversal of 20842841 is 14824802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17884441 + 2958400 = 4229^2 + 1720^2 .

It is a cyclic number.

It is not a de Polignac number, because 20842841 - 2² = 20842837 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20842847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9056 + ... + 11121.

It is an arithmetic number, because the mean of its divisors is an integer number (5216013).

Almost surely, 2^20842841 is an apocalyptic number.

It is an amenable number.

20842841 is a deficient number, since it is larger than the sum of its proper divisors (21211).

20842841 is a wasteful number, since it uses less digits than its factorization.

20842841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21210.

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 20842841 is about 4565.3960397757. The cubic root of 20842841 is about 275.2024558734.

The spelling of 20842841 in words is "twenty million, eight hundred forty-two thousand, eight hundred forty-one".