20782005 has 16 divisors (see below), whose sum is σ = 33708480. Its totient is φ = 10931328.

The previous prime is 20781931. The next prime is 20782031. The reversal of 20782005 is 50028702.

It is not a de Polignac number, because 20782005 - 2⁹ = 20781493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8395 + ... + 10584.

It is an arithmetic number, because the mean of its divisors is an integer number (2106780).

Almost surely, 2^20782005 is an apocalyptic number.

It is an amenable number.

20782005 is a deficient number, since it is larger than the sum of its proper divisors (12926475).

20782005 is a wasteful number, since it uses less digits than its factorization.

20782005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19060.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 20782005 is about 4558.7284411336. The cubic root of 20782005 is about 274.9344416728.

The spelling of 20782005 in words is "twenty million, seven hundred eighty-two thousand, five".