20042426 has 4 divisors (see below), whose sum is σ = 30063642. Its totient is φ = 10021212.

The previous prime is 20042417. The next prime is 20042443. The reversal of 20042426 is 62424002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62424002 = 2 ⋅31212001.

It can be written as a sum of positive squares in only one way, i.e., 19404025 + 638401 = 4405^2 + 799^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20042398 and 20042407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010605 + ... + 5010608.

Almost surely, 2^20042426 is an apocalyptic number.

20042426 is a deficient number, since it is larger than the sum of its proper divisors (10021216).

20042426 is a wasteful number, since it uses less digits than its factorization.

20042426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10021215.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 20042426 is about 4476.8768131366. The cubic root of 20042426 is about 271.6335625706.

Adding to 20042426 its reverse (62424002), we get a palindrome (82466428).

The spelling of 20042426 in words is "twenty million, forty-two thousand, four hundred twenty-six".