20708805 has 32 divisors (see below), whose sum is σ = 37787904. Its totient is φ = 9593856.

The previous prime is 20708791. The next prime is 20708819. The reversal of 20708805 is 50880702.

It is an interprime number because it is at equal distance from previous prime (20708791) and next prime (20708819).

It is not a de Polignac number, because 20708805 - 2⁶ = 20708741 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 192 + ... + 6438.

It is an arithmetic number, because the mean of its divisors is an integer number (1180872).

Almost surely, 2^20708805 is an apocalyptic number.

It is an amenable number.

20708805 is a deficient number, since it is larger than the sum of its proper divisors (17079099).

20708805 is a wasteful number, since it uses less digits than its factorization.

20708805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6285.

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 20708805 is about 4550.6928043980. The cubic root of 20708805 is about 274.6112634179.

The spelling of 20708805 in words is "twenty million, seven hundred eight thousand, eight hundred five".