20426407 has 4 divisors (see below), whose sum is σ = 20617416. Its totient is φ = 20235400.

The previous prime is 20426389. The next prime is 20426423. The reversal of 20426407 is 70462402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20426407 - 2⁷ = 20426279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20426447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95344 + ... + 95557.

It is an arithmetic number, because the mean of its divisors is an integer number (5154354).

Almost surely, 2^20426407 is an apocalyptic number.

20426407 is a deficient number, since it is larger than the sum of its proper divisors (191009).

20426407 is a wasteful number, since it uses less digits than its factorization.

20426407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191008.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 20426407 is about 4519.5582748760. The cubic root of 20426407 is about 273.3572900213.

Adding to 20426407 its reverse (70462402), we get a palindrome (90888809).

The spelling of 20426407 in words is "twenty million, four hundred twenty-six thousand, four hundred seven".