20671031 has 8 divisors (see below), whose sum is σ = 23039280. Its totient is φ = 18430848.

The previous prime is 20671019. The next prime is 20671033. The reversal of 20671031 is 13017602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20671031 - 2¹⁰ = 20670007 is a prime.

It is a super-2 number, since 2×20671031² = 854583045205922, 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 = 20670994 and 20671012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20671033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31676 + ... + 32321.

It is an arithmetic number, because the mean of its divisors is an integer number (2879910).

Almost surely, 2^20671031 is an apocalyptic number.

20671031 is a deficient number, since it is larger than the sum of its proper divisors (2368249).

20671031 is a wasteful number, since it uses less digits than its factorization.

20671031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64033.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 20671031 is about 4546.5405529919. The cubic root of 20671031 is about 274.4441931091. Note that the first 3 decimals are identical.

Adding to 20671031 its reverse (13017602), we get a palindrome (33688633).

The spelling of 20671031 in words is "twenty million, six hundred seventy-one thousand, thirty-one".