20866479 has 8 divisors (see below), whose sum is σ = 27850752. Its totient is φ = 13896600.

The previous prime is 20866421. The next prime is 20866493. The reversal of 20866479 is 97466802.

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

It is not a de Polignac number, because 20866479 - 2⁹ = 20865967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20866479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20866679) 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, 432 + ... + 6474.

It is an arithmetic number, because the mean of its divisors is an integer number (3481344).

Almost surely, 2^20866479 is an apocalyptic number.

20866479 is a deficient number, since it is larger than the sum of its proper divisors (6984273).

20866479 is a wasteful number, since it uses less digits than its factorization.

20866479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7197.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 20866479 is about 4567.9841286940. The cubic root of 20866479 is about 275.3064528604.

The spelling of 20866479 in words is "twenty million, eight hundred sixty-six thousand, four hundred seventy-nine".