20123845 has 8 divisors (see below), whose sum is σ = 27598464. Its totient is φ = 13799184.

The previous prime is 20123843. The next prime is 20123861. The reversal of 20123845 is 54832102.

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

It is not a de Polignac number, because 20123845 - 2¹ = 20123843 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287449 + ... + 287518.

It is an arithmetic number, because the mean of its divisors is an integer number (3449808).

Almost surely, 2^20123845 is an apocalyptic number.

It is an amenable number.

20123845 is a deficient number, since it is larger than the sum of its proper divisors (7474619).

20123845 is an equidigital number, since it uses as much as digits as its factorization.

20123845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574979.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20123845 is about 4485.9608781174. The cubic root of 20123845 is about 272.0008875764. Note that the first 3 decimals are identical.

Adding to 20123845 its reverse (54832102), we get a palindrome (74955947).

The spelling of 20123845 in words is "twenty million, one hundred twenty-three thousand, eight hundred forty-five".