20507489 has 4 divisors (see below), whose sum is σ = 20518080. Its totient is φ = 20496900.

The previous prime is 20507483. The next prime is 20507507. The reversal of 20507489 is 98470502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20507489 - 2¹² = 20503393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20507483) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1469 + ... + 6570.

It is an arithmetic number, because the mean of its divisors is an integer number (5129520).

Almost surely, 2^20507489 is an apocalyptic number.

It is an amenable number.

20507489 is a deficient number, since it is larger than the sum of its proper divisors (10591).

20507489 is an equidigital number, since it uses as much as digits as its factorization.

20507489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10590.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 20507489 is about 4528.5195152500. The cubic root of 20507489 is about 273.7185069725.

The spelling of 20507489 in words is "twenty million, five hundred seven thousand, four hundred eighty-nine".