20613705 has 32 divisors (see below), whose sum is σ = 37995264. Its totient is φ = 9348096.

The previous prime is 20613647. The next prime is 20613731. The reversal of 20613705 is 50731602.

It is not a de Polignac number, because 20613705 - 2⁹ = 20613193 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 13669 + ... + 15101.

It is an arithmetic number, because the mean of its divisors is an integer number (1187352).

Almost surely, 2^20613705 is an apocalyptic number.

It is an amenable number.

20613705 is a deficient number, since it is larger than the sum of its proper divisors (17381559).

20613705 is a wasteful number, since it uses less digits than its factorization.

20613705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 20613705 is about 4540.2318222752. The cubic root of 20613705 is about 274.1902571551.

The spelling of 20613705 in words is "twenty million, six hundred thirteen thousand, seven hundred five".