20727071 has 4 divisors (see below), whose sum is σ = 21628272. Its totient is φ = 19825872.

The previous prime is 20727061. The next prime is 20727073. The reversal of 20727071 is 17072702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17072702 = 2 ⋅8536351.

It is a cyclic number.

It is not a de Polignac number, because 20727071 - 2¹⁰ = 20726047 is a prime.

It is a super-2 number, since 2×20727071² = 859222944478082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20727071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20727073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450566 + ... + 450611.

It is an arithmetic number, because the mean of its divisors is an integer number (5407068).

Almost surely, 2^20727071 is an apocalyptic number.

20727071 is a deficient number, since it is larger than the sum of its proper divisors (901201).

20727071 is an equidigital number, since it uses as much as digits as its factorization.

20727071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901200.

The product of its (nonzero) digits is 1372, while the sum is 26.

The square root of 20727071 is about 4552.6993092011. The cubic root of 20727071 is about 274.6919790889.

Adding to 20727071 its reverse (17072702), we get a palindrome (37799773).

The spelling of 20727071 in words is "twenty million, seven hundred twenty-seven thousand, seventy-one".