20442423 has 32 divisors (see below), whose sum is σ = 30965760. Its totient is φ = 11927520.

The previous prime is 20442413. The next prime is 20442427. The reversal of 20442423 is 32424402.

It is not a de Polignac number, because 20442423 - 2¹³ = 20434231 is a prime.

It is a super-2 number, since 2×20442423² = 835785316221858, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20442423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20442427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40390 + ... + 40892.

It is an arithmetic number, because the mean of its divisors is an integer number (967680).

Almost surely, 2^20442423 is an apocalyptic number.

20442423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20442423 is a deficient number, since it is larger than the sum of its proper divisors (10523337).

20442423 is a wasteful number, since it uses less digits than its factorization.

20442423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579.

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 20442423 is about 4521.3297822654. The cubic root of 20442423 is about 273.4287162980.

Adding to 20442423 its reverse (32424402), we get a palindrome (52866825).

The spelling of 20442423 in words is "twenty million, four hundred forty-two thousand, four hundred twenty-three".