20841643 has 8 divisors (see below), whose sum is σ = 22114512. Its totient is φ = 19574016.

The previous prime is 20841637. The next prime is 20841647. The reversal of 20841643 is 34614802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20841643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20841647) 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, 9496 + ... + 11482.

It is an arithmetic number, because the mean of its divisors is an integer number (2764314).

Almost surely, 2^20841643 is an apocalyptic number.

20841643 is a deficient number, since it is larger than the sum of its proper divisors (1272869).

20841643 is a wasteful number, since it uses less digits than its factorization.

20841643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2621.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 20841643 is about 4565.2648335009. The cubic root of 20841643 is about 275.1971830980.

The spelling of 20841643 in words is "twenty million, eight hundred forty-one thousand, six hundred forty-three".