20890587 has 8 divisors (see below), whose sum is σ = 27881280. Its totient is φ = 13913480.

The previous prime is 20890579. The next prime is 20890589. The reversal of 20890587 is 78509802.

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 20890587 - 2³ = 20890579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20890589) 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, 1012 + ... + 6542.

It is an arithmetic number, because the mean of its divisors is an integer number (3485160).

Almost surely, 2^20890587 is an apocalyptic number.

20890587 is a deficient number, since it is larger than the sum of its proper divisors (6990693).

20890587 is a wasteful number, since it uses less digits than its factorization.

20890587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6793.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 20890587 is about 4570.6221677142. The cubic root of 20890587 is about 275.4124367778.

The spelling of 20890587 in words is "twenty million, eight hundred ninety thousand, five hundred eighty-seven".