20671131 has 16 divisors (see below), whose sum is σ = 30171680. Its totient is φ = 12510720.

The previous prime is 20671129. The next prime is 20671139. The reversal of 20671131 is 13117602.

It is not a de Polignac number, because 20671131 - 2¹ = 20671129 is a prime.

It is a super-2 number, since 2×20671131² = 854591313638322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20671098 and 20671107.

It is not an unprimeable number, because it can be changed into a prime (20671139) 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, 1966 + ... + 6723.

It is an arithmetic number, because the mean of its divisors is an integer number (1885730).

Almost surely, 2^20671131 is an apocalyptic number.

20671131 is a deficient number, since it is larger than the sum of its proper divisors (9500549).

20671131 is a wasteful number, since it uses less digits than its factorization.

20671131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8766.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 20671131 is about 4546.5515503511. The cubic root of 20671131 is about 274.4446356669. Note that the first 3 decimals are identical.

Adding to 20671131 its reverse (13117602), we get a palindrome (33788733).

It can be divided in two parts, 20671 and 131, that added together give a palindrome (20802).

The spelling of 20671131 in words is "twenty million, six hundred seventy-one thousand, one hundred thirty-one".