20713805 has 16 divisors (see below), whose sum is σ = 28496640. Its totient is φ = 14159232.

The previous prime is 20713799. The next prime is 20713829. The reversal of 20713805 is 50831702.

It is a cyclic number.

It is not a de Polignac number, because 20713805 - 2⁶ = 20713741 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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13592 + ... + 15038.

It is an arithmetic number, because the mean of its divisors is an integer number (1781040).

Almost surely, 2^20713805 is an apocalyptic number.

It is an amenable number.

20713805 is a deficient number, since it is larger than the sum of its proper divisors (7782835).

20713805 is a wasteful number, since it uses less digits than its factorization.

20713805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20713805 is about 4551.2421381421. The cubic root of 20713805 is about 274.6333626462.

The spelling of 20713805 in words is "twenty million, seven hundred thirteen thousand, eight hundred five".