20271745 has 16 divisors (see below), whose sum is σ = 26908560. Its totient is φ = 14563584.

The previous prime is 20271733. The next prime is 20271749. The reversal of 20271745 is 54717202.

It can be written as a sum of positive squares in 8 ways, for example, as 982081 + 19289664 = 991^2 + 4392^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20271745 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20271749) 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, 1810 + ... + 6619.

It is an arithmetic number, because the mean of its divisors is an integer number (1681785).

Almost surely, 2^20271745 is an apocalyptic number.

It is an amenable number.

20271745 is a deficient number, since it is larger than the sum of its proper divisors (6636815).

20271745 is a wasteful number, since it uses less digits than its factorization.

20271745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8484.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 20271745 is about 4502.4154628377. The cubic root of 20271745 is about 272.6656176958.

Adding to 20271745 its reverse (54717202), we get a palindrome (74988947).

The spelling of 20271745 in words is "twenty million, two hundred seventy-one thousand, seven hundred forty-five".