20144509 has 16 divisors (see below), whose sum is σ = 25214976. Its totient is φ = 15634800.

The previous prime is 20144497. The next prime is 20144519. The reversal of 20144509 is 90544102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20144509 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 (20144519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32884 + ... + 33490.

It is an arithmetic number, because the mean of its divisors is an integer number (1575936).

Almost surely, 2^20144509 is an apocalyptic number.

It is an amenable number.

20144509 is a deficient number, since it is larger than the sum of its proper divisors (5070467).

20144509 is a wasteful number, since it uses less digits than its factorization.

20144509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20144509 is about 4488.2634726584. The cubic root of 20144509 is about 272.0939563315.

The spelling of 20144509 in words is "twenty million, one hundred forty-four thousand, five hundred nine".