20860609 has 16 divisors (see below), whose sum is σ = 27141120. Its totient is φ = 15546960.

The previous prime is 20860607. The next prime is 20860627. The reversal of 20860609 is 90606802.

It is not a de Polignac number, because 20860609 - 2¹ = 20860607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20860601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4119 + ... + 7660.

It is an arithmetic number, because the mean of its divisors is an integer number (1696320).

Almost surely, 2^20860609 is an apocalyptic number.

It is an amenable number.

20860609 is a deficient number, since it is larger than the sum of its proper divisors (6280511).

20860609 is a wasteful number, since it uses less digits than its factorization.

20860609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11820.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20860609 is about 4567.3415681335. The cubic root of 20860609 is about 275.2806347298.

The spelling of 20860609 in words is "twenty million, eight hundred sixty thousand, six hundred nine".