20479287 has 16 divisors (see below), whose sum is σ = 27950720. Its totient is φ = 13334112.

The previous prime is 20479279. The next prime is 20479297. The reversal of 20479287 is 78297402.

It is not a de Polignac number, because 20479287 - 2³ = 20479279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20479297) 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, 27573 + ... + 28305.

It is an arithmetic number, because the mean of its divisors is an integer number (1746920).

Almost surely, 2^20479287 is an apocalyptic number.

20479287 is a deficient number, since it is larger than the sum of its proper divisors (7471433).

20479287 is a wasteful number, since it uses less digits than its factorization.

20479287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 20479287 is about 4525.4046227934. The cubic root of 20479287 is about 273.5929763980.

The spelling of 20479287 in words is "twenty million, four hundred seventy-nine thousand, two hundred eighty-seven".