20872601 has 2 divisors, whose sum is σ = 20872602. Its totient is φ = 20872600.

The previous prime is 20872589. The next prime is 20872603. The reversal of 20872601 is 10627802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18696976 + 2175625 = 4324^2 + 1475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20872601 is a prime.

Together with 20872603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20872603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10436300 + 10436301.

It is an arithmetic number, because the mean of its divisors is an integer number (10436301).

Almost surely, 2^20872601 is an apocalyptic number.

It is an amenable number.

20872601 is a deficient number, since it is larger than the sum of its proper divisors (1).

20872601 is an equidigital number, since it uses as much as digits as its factorization.

20872601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 20872601 is about 4568.6541782017. The cubic root of 20872601 is about 275.3333742096. Note that the first 4 decimals are identical.

The spelling of 20872601 in words is "twenty million, eight hundred seventy-two thousand, six hundred one".