20009487 has 8 divisors (see below), whose sum is σ = 26815536. Its totient is φ = 13271552.

The previous prime is 20009453. The next prime is 20009497. The reversal of 20009487 is 78490002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20009487 - 2²⁰ = 18960911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20009447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16338 + ... + 17519.

It is an arithmetic number, because the mean of its divisors is an integer number (3351942).

Almost surely, 2^20009487 is an apocalyptic number.

20009487 is a deficient number, since it is larger than the sum of its proper divisors (6806049).

20009487 is a wasteful number, since it uses less digits than its factorization.

20009487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34057.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20009487 is about 4473.1965080913. The cubic root of 20009487 is about 271.4846743415.

Adding to 20009487 its reverse (78490002), we get a palindrome (98499489).

The spelling of 20009487 in words is "twenty million, nine thousand, four hundred eighty-seven".