20706131 has 2 divisors, whose sum is σ = 20706132. Its totient is φ = 20706130.

The previous prime is 20706121. The next prime is 20706151. The reversal of 20706131 is 13160702.

It is a happy number.

It is an a-pointer prime, because the next prime (20706151) can be obtained adding 20706131 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20706131 - 2¹⁰ = 20705107 is a prime.

It is a super-2 number, since 2×20706131² = 857487721978322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20706121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10353065 + 10353066.

It is an arithmetic number, because the mean of its divisors is an integer number (10353066).

Almost surely, 2^20706131 is an apocalyptic number.

20706131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20706131 is an equidigital number, since it uses as much as digits as its factorization.

20706131 is an evil number, because the sum of its binary digits is even.

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

The square root of 20706131 is about 4550.3989934950. The cubic root of 20706131 is about 274.5994432907.

Adding to 20706131 its reverse (13160702), we get a palindrome (33866833).

The spelling of 20706131 in words is "twenty million, seven hundred six thousand, one hundred thirty-one".