20670487 has 8 divisors (see below), whose sum is σ = 22396176. Its totient is φ = 19001472.

The previous prime is 20670479. The next prime is 20670497. The reversal of 20670487 is 78407602.

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 20670487 - 2³ = 20670479 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 (20670427) 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 7 ways as a sum of consecutive naturals, for example, 13408 + ... + 14869.

It is an arithmetic number, because the mean of its divisors is an integer number (2799522).

Almost surely, 2^20670487 is an apocalyptic number.

20670487 is a deficient number, since it is larger than the sum of its proper divisors (1725689).

20670487 is a wasteful number, since it uses less digits than its factorization.

20670487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28337.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 20670487 is about 4546.4807268920. The cubic root of 20670487 is about 274.4417855699.

The spelling of 20670487 in words is "twenty million, six hundred seventy thousand, four hundred eighty-seven".