20123445 has 16 divisors (see below), whose sum is σ = 32326272. Its totient is φ = 10689600.

The previous prime is 20123443. The next prime is 20123479. The reversal of 20123445 is 54432102.

It is not a de Polignac number, because 20123445 - 2¹ = 20123443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1395 + ... + 6495.

It is an arithmetic number, because the mean of its divisors is an integer number (2020392).

Almost surely, 2^20123445 is an apocalyptic number.

It is an amenable number.

20123445 is a deficient number, since it is larger than the sum of its proper divisors (12202827).

20123445 is a wasteful number, since it uses less digits than its factorization.

20123445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5372.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20123445 is about 4485.9162943595. The cubic root of 20123445 is about 271.9990853848. Note that the first 3 decimals are identical.

Adding to 20123445 its reverse (54432102), we get a palindrome (74555547).

The spelling of 20123445 in words is "twenty million, one hundred twenty-three thousand, four hundred forty-five".