20430042 has 16 divisors (see below), whose sum is σ = 41470752. Its totient is φ = 6708240.

The previous prime is 20430041. The next prime is 20430071. The reversal of 20430042 is 24003402.

It is a happy number.

It is a super-2 number, since 2×20430042² = 834773232243528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20430041) 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, 25009 + ... + 25812.

It is an arithmetic number, because the mean of its divisors is an integer number (2591922).

Almost surely, 2^20430042 is an apocalyptic number.

20430042 is an abundant number, since it is smaller than the sum of its proper divisors (21040710).

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

20430042 is a wasteful number, since it uses less digits than its factorization.

20430042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50893.

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 20430042 is about 4519.9603980566. The cubic root of 20430042 is about 273.3735042420.

Adding to 20430042 its reverse (24003402), we get a palindrome (44433444).

The spelling of 20430042 in words is "twenty million, four hundred thirty thousand, forty-two".