20145442 has 16 divisors (see below), whose sum is σ = 32247072. Its totient is φ = 9405760.

The previous prime is 20145421. The next prime is 20145449. The reversal of 20145442 is 24454102.

It is a happy number.

It is a super-3 number, since 3×20145442³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20145449) 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 7 ways as a sum of consecutive naturals, for example, 2193 + ... + 6715.

It is an arithmetic number, because the mean of its divisors is an integer number (2015442).

Almost surely, 2^20145442 is an apocalyptic number.

20145442 is a deficient number, since it is larger than the sum of its proper divisors (12101630).

20145442 is a wasteful number, since it uses less digits than its factorization.

20145442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4673.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 20145442 is about 4488.3674092035. The cubic root of 20145442 is about 272.0981569757.

Adding to 20145442 its reverse (24454102), we get a palindrome (44599544).

The spelling of 20145442 in words is "twenty million, one hundred forty-five thousand, four hundred forty-two".