20860646 has 4 divisors (see below), whose sum is σ = 31290972. Its totient is φ = 10430322.

The previous prime is 20860643. The next prime is 20860667. The reversal of 20860646 is 64606802.

It is a happy number.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 5215160 + ... + 5215163.

It is an arithmetic number, because the mean of its divisors is an integer number (7822743).

Almost surely, 2^20860646 is an apocalyptic number.

20860646 is a deficient number, since it is larger than the sum of its proper divisors (10430326).

20860646 is a wasteful number, since it uses less digits than its factorization.

20860646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10430325.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 20860646 is about 4567.3456186280. The cubic root of 20860646 is about 275.2807974827.

The spelling of 20860646 in words is "twenty million, eight hundred sixty thousand, six hundred forty-six".