20842447 has 8 divisors (see below), whose sum is σ = 21579392. Its totient is φ = 20109600.

The previous prime is 20842441. The next prime is 20842453. The reversal of 20842447 is 74424802.

It is an interprime number because it is at equal distance from previous prime (20842441) and next prime (20842453).

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

It is a cyclic number.

It is not a de Polignac number, because 20842447 - 2⁷ = 20842319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20842441) 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, 12253 + ... + 13849.

It is an arithmetic number, because the mean of its divisors is an integer number (2697424).

Almost surely, 2^20842447 is an apocalyptic number.

20842447 is a deficient number, since it is larger than the sum of its proper divisors (736945).

20842447 is a wasteful number, since it uses less digits than its factorization.

20842447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2049.

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 20842447 is about 4565.3528888795. The cubic root of 20842447 is about 275.2007217776.

The spelling of 20842447 in words is "twenty million, eight hundred forty-two thousand, four hundred forty-seven".