20711617 has 2 divisors, whose sum is σ = 20711618. Its totient is φ = 20711616.

The previous prime is 20711611. The next prime is 20711629. The reversal of 20711617 is 71611702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20711601 + 16 = 4551^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 20711617 - 2³ = 20711609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20711591 and 20711600.

It is not a weakly prime, because it can be changed into another prime (20711611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10355808 + 10355809.

It is an arithmetic number, because the mean of its divisors is an integer number (10355809).

Almost surely, 2^20711617 is an apocalyptic number.

It is an amenable number.

20711617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20711617 is an equidigital number, since it uses as much as digits as its factorization.

20711617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 20711617 is about 4551.0017578551. The cubic root of 20711617 is about 274.6236924615.

The spelling of 20711617 in words is "twenty million, seven hundred eleven thousand, six hundred seventeen".