20847741 has 4 divisors (see below), whose sum is σ = 27796992. Its totient is φ = 13898492.

The previous prime is 20847737. The next prime is 20847751. The reversal of 20847741 is 14774802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20847741 - 2² = 20847737 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20847751) 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, 3474621 + ... + 3474626.

It is an arithmetic number, because the mean of its divisors is an integer number (6949248).

Almost surely, 2^20847741 is an apocalyptic number.

It is an amenable number.

20847741 is a deficient number, since it is larger than the sum of its proper divisors (6949251).

20847741 is an equidigital number, since it uses as much as digits as its factorization.

20847741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6949250.

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 20847741 is about 4565.9326539054. The cubic root of 20847741 is about 275.2240202142.

The spelling of 20847741 in words is "twenty million, eight hundred forty-seven thousand, seven hundred forty-one".