20985127 has 2 divisors, whose sum is σ = 20985128. Its totient is φ = 20985126.

The previous prime is 20985121. The next prime is 20985143. The reversal of 20985127 is 72158902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20985127 - 2³ = 20985119 is a prime.

It is a super-2 number, since 2×20985127² = 880751110412258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20985092 and 20985101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20985121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10492563 + 10492564.

It is an arithmetic number, because the mean of its divisors is an integer number (10492564).

Almost surely, 2^20985127 is an apocalyptic number.

20985127 is a deficient number, since it is larger than the sum of its proper divisors (1).

20985127 is an equidigital number, since it uses as much as digits as its factorization.

20985127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 20985127 is about 4580.9526301851. The cubic root of 20985127 is about 275.8272697488.

It can be divided in two parts, 20985 and 127, that added together give a palindrome (21112).

The spelling of 20985127 in words is "twenty million, nine hundred eighty-five thousand, one hundred twenty-seven".