20212423 has 32 divisors (see below), whose sum is σ = 26790912. Its totient is φ = 14784000.

The previous prime is 20212421. The next prime is 20212453. The reversal of 20212423 is 32421202.

It is not a de Polignac number, because 20212423 - 2¹ = 20212421 is a prime.

It is a Duffinian number.

20212423 is a modest number, since divided by 12423 gives 202 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 20212397 and 20212406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212421) 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 31 ways as a sum of consecutive naturals, for example, 178815 + ... + 178927.

It is an arithmetic number, because the mean of its divisors is an integer number (837216).

Almost surely, 2^20212423 is an apocalyptic number.

20212423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20212423 is a deficient number, since it is larger than the sum of its proper divisors (6578489).

20212423 is a wasteful number, since it uses less digits than its factorization.

20212423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20212423 is about 4495.8228390363. The cubic root of 20212423 is about 272.3993871470.

Adding to 20212423 its reverse (32421202), we get a palindrome (52633625).

It can be divided in two parts, 2021 and 2423, that added together give a palindrome (4444).

The spelling of 20212423 in words is "twenty million, two hundred twelve thousand, four hundred twenty-three".