20860647 has 8 divisors (see below), whose sum is σ = 27891456. Its totient is φ = 13868472.

The previous prime is 20860643. The next prime is 20860667. The reversal of 20860647 is 74606802.

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

It is not a de Polignac number, because 20860647 - 2² = 20860643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20860643) 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, 8373 + ... + 10574.

It is an arithmetic number, because the mean of its divisors is an integer number (3486432).

Almost surely, 2^20860647 is an apocalyptic number.

20860647 is a deficient number, since it is larger than the sum of its proper divisors (7030809).

20860647 is a wasteful number, since it uses less digits than its factorization.

20860647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19317.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 20860647 is about 4567.3457281007. The cubic root of 20860647 is about 275.2808018815.

The spelling of 20860647 in words is "twenty million, eight hundred sixty thousand, six hundred forty-seven".