20860645 has 16 divisors (see below), whose sum is σ = 27054720. Its totient is φ = 15349824.

The previous prime is 20860643. The next prime is 20860667. The reversal of 20860645 is 54606802.

It is a cyclic number.

It is not a de Polignac number, because 20860645 - 2¹ = 20860643 is a prime.

It is a super-3 number, since 3×20860645³ (a number of 23 digits) contains 333 as substring.

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 15 ways as a sum of consecutive naturals, for example, 31326 + ... + 31984.

It is an arithmetic number, because the mean of its divisors is an integer number (1690920).

Almost surely, 2^20860645 is an apocalyptic number.

It is an amenable number.

20860645 is a deficient number, since it is larger than the sum of its proper divisors (6194075).

20860645 is a wasteful number, since it uses less digits than its factorization.

20860645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 20860645 is about 4567.3455091552. The cubic root of 20860645 is about 275.2807930840.

The spelling of 20860645 in words is "twenty million, eight hundred sixty thousand, six hundred forty-five".