20426427 has 24 divisors (see below), whose sum is σ = 34810880. Its totient is φ = 11294640.

The previous prime is 20426423. The next prime is 20426429. The reversal of 20426427 is 72462402.

It is a happy number.

20426427 is nontrivially palindromic in base 5.

It is not a de Polignac number, because 20426427 - 2² = 20426423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20426427.

It is not an unprimeable number, because it can be changed into a prime (20426423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3277 + ... + 7182.

Almost surely, 2^20426427 is an apocalyptic number.

20426427 is a deficient number, since it is larger than the sum of its proper divisors (14384453).

20426427 is a wasteful number, since it uses less digits than its factorization.

20426427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10503 (or 10500 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 20426427 is about 4519.5604874811. The cubic root of 20426427 is about 273.3573792382.

Adding to 20426427 its reverse (72462402), we get a palindrome (92888829).

The spelling of 20426427 in words is "twenty million, four hundred twenty-six thousand, four hundred twenty-seven".