20780271 has 6 divisors (see below), whose sum is σ = 30015960. Its totient is φ = 13853508.

The previous prime is 20780257. The next prime is 20780303. The reversal of 20780271 is 17208702.

It is not a de Polignac number, because 20780271 - 2⁷ = 20780143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1154451 + ... + 1154468.

It is an arithmetic number, because the mean of its divisors is an integer number (5002660).

Almost surely, 2^20780271 is an apocalyptic number.

20780271 is a deficient number, since it is larger than the sum of its proper divisors (9235689).

20780271 is a wasteful number, since it uses less digits than its factorization.

20780271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2308925 (or 2308922 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 20780271 is about 4558.5382525542. The cubic root of 20780271 is about 274.9267948395.

Adding to 20780271 its reverse (17208702), we get a palindrome (37988973).

The spelling of 20780271 in words is "twenty million, seven hundred eighty thousand, two hundred seventy-one".