20123847 has 12 divisors (see below), whose sum is σ = 29174184. Its totient is φ = 13366800.

The previous prime is 20123843. The next prime is 20123861. The reversal of 20123847 is 74832102.

It is not a de Polignac number, because 20123847 - 2² = 20123843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20123847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1404 + ... + 6497.

It is an arithmetic number, because the mean of its divisors is an integer number (2431182).

Almost surely, 2^20123847 is an apocalyptic number.

20123847 is a deficient number, since it is larger than the sum of its proper divisors (9050337).

20123847 is a wasteful number, since it uses less digits than its factorization.

20123847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8190 (or 8187 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20123847 is about 4485.9611010351. The cubic root of 20123847 is about 272.0008965873. Note that the first 3 decimals are identical.

Adding to 20123847 its reverse (74832102), we get a palindrome (94955949).

The spelling of 20123847 in words is "twenty million, one hundred twenty-three thousand, eight hundred forty-seven".