20315705 has 16 divisors (see below), whose sum is σ = 25223184. Its totient is φ = 15697920.

The previous prime is 20315699. The next prime is 20315707. The reversal of 20315705 is 50751302.

It can be written as a sum of positive squares in 8 ways, for example, as 4507129 + 15808576 = 2123^2 + 3976^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20315705 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20315707) 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, 22727 + ... + 23603.

It is an arithmetic number, because the mean of its divisors is an integer number (1576449).

Almost surely, 2^20315705 is an apocalyptic number.

It is an amenable number.

20315705 is a deficient number, since it is larger than the sum of its proper divisors (4907479).

20315705 is a wasteful number, since it uses less digits than its factorization.

20315705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 20315705 is about 4507.2946431313. The cubic root of 20315705 is about 272.8625704278.

The spelling of 20315705 in words is "twenty million, three hundred fifteen thousand, seven hundred five".