20424042 has 16 divisors (see below), whose sum is σ = 45386880. Its totient is φ = 6807996.

The previous prime is 20423989. The next prime is 20424043. The reversal of 20424042 is 24042402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20424043) 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, 189058 + ... + 189165.

It is an arithmetic number, because the mean of its divisors is an integer number (2836680).

Almost surely, 2^20424042 is an apocalyptic number.

20424042 is an abundant number, since it is smaller than the sum of its proper divisors (24962838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20424042 is a wasteful number, since it uses less digits than its factorization.

20424042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378234 (or 378228 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 20424042 is about 4519.2966266887. The cubic root of 20424042 is about 273.3467397086.

Adding to 20424042 its reverse (24042402), we get a palindrome (44466444).

It can be divided in two parts, 2042 and 4042, that added together give a square (6084 = 78²).

The spelling of 20424042 in words is "twenty million, four hundred twenty-four thousand, forty-two".