20616601 has 2 divisors, whose sum is σ = 20616602. Its totient is φ = 20616600.

The previous prime is 20616569. The next prime is 20616623. The reversal of 20616601 is 10661602.

It is an a-pointer prime, because the next prime (20616623) can be obtained adding 20616601 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15023376 + 5593225 = 3876^2 + 2365^2 .

It is a cyclic number.

It is not a de Polignac number, because 20616601 - 2⁵ = 20616569 is a prime.

It is not a weakly prime, because it can be changed into another prime (20616301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10308300 + 10308301.

It is an arithmetic number, because the mean of its divisors is an integer number (10308301).

Almost surely, 2^20616601 is an apocalyptic number.

It is an amenable number.

20616601 is a deficient number, since it is larger than the sum of its proper divisors (1).

20616601 is an equidigital number, since it uses as much as digits as its factorization.

20616601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20616601 is about 4540.5507375207. The cubic root of 20616601 is about 274.2030967975.

It can be divided in two parts, 206 and 16601, that added together give a 5-th power (16807 = 7⁵).

The spelling of 20616601 in words is "twenty million, six hundred sixteen thousand, six hundred one".