20670387 has 8 divisors (see below), whose sum is σ = 27602640. Its totient is φ = 13759200.

The previous prime is 20670379. The next prime is 20670421. The reversal of 20670387 is 78307602.

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

It is not a de Polignac number, because 20670387 - 2³ = 20670379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20670337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2812 + ... + 7017.

It is an arithmetic number, because the mean of its divisors is an integer number (3450330).

Almost surely, 2^20670387 is an apocalyptic number.

20670387 is a deficient number, since it is larger than the sum of its proper divisors (6932253).

20670387 is an equidigital number, since it uses as much as digits as its factorization.

20670387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10533.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 20670387 is about 4546.4697293615. The cubic root of 20670387 is about 274.4413430030.

Adding to 20670387 its reverse (78307602), we get a palindrome (98977989).

The spelling of 20670387 in words is "twenty million, six hundred seventy thousand, three hundred eighty-seven".