20144407 has 4 divisors (see below), whose sum is σ = 20635776. Its totient is φ = 19653040.

The previous prime is 20144387. The next prime is 20144417. The reversal of 20144407 is 70444102.

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 20144407 - 2⁷ = 20144279 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 (20144417) 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, 245623 + ... + 245704.

It is an arithmetic number, because the mean of its divisors is an integer number (5158944).

Almost surely, 2^20144407 is an apocalyptic number.

20144407 is a deficient number, since it is larger than the sum of its proper divisors (491369).

20144407 is an equidigital number, since it uses as much as digits as its factorization.

20144407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491368.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 20144407 is about 4488.2521096748. The cubic root of 20144407 is about 272.0934970892.

Adding to 20144407 its reverse (70444102), we get a palindrome (90588509).

The spelling of 20144407 in words is "twenty million, one hundred forty-four thousand, four hundred seven".