20680371 has 6 divisors (see below), whose sum is σ = 29871660. Its totient is φ = 13786908.

The previous prime is 20680369. The next prime is 20680391. The reversal of 20680371 is 17308602.

It is not a de Polignac number, because 20680371 - 2¹ = 20680369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20680391) 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, 1148901 + ... + 1148918.

It is an arithmetic number, because the mean of its divisors is an integer number (4978610).

Almost surely, 2^20680371 is an apocalyptic number.

20680371 is a deficient number, since it is larger than the sum of its proper divisors (9191289).

20680371 is a wasteful number, since it uses less digits than its factorization.

20680371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297825 (or 2297822 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20680371 is about 4547.5675915812. The cubic root of 20680371 is about 274.4855218458.

Adding to 20680371 its reverse (17308602), we get a palindrome (37988973).

The spelling of 20680371 in words is "twenty million, six hundred eighty thousand, three hundred seventy-one".