20240442 has 24 divisors (see below), whose sum is σ = 45479616. Its totient is φ = 6746652.

The previous prime is 20240431. The next prime is 20240449. The reversal of 20240442 is 24404202.

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 (20240449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20338 + ... + 21309.

It is an arithmetic number, because the mean of its divisors is an integer number (1894984).

Almost surely, 2^20240442 is an apocalyptic number.

20240442 is an abundant number, since it is smaller than the sum of its proper divisors (25239174).

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

20240442 is an equidigital number, since it uses as much as digits as its factorization.

20240442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41664 (or 41652 counting only the distinct ones).

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

The square root of 20240442 is about 4498.9378746544. The cubic root of 20240442 is about 272.5251981300.

Adding to 20240442 its reverse (24404202), we get a palindrome (44644644).

The spelling of 20240442 in words is "twenty million, two hundred forty thousand, four hundred forty-two".