20981201 has 2 divisors, whose sum is σ = 20981202. Its totient is φ = 20981200.

The previous prime is 20981189. The next prime is 20981231. The reversal of 20981201 is 10218902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19228225 + 1752976 = 4385^2 + 1324^2 .

It is a cyclic number.

It is not a de Polignac number, because 20981201 - 2¹⁰ = 20980177 is a prime.

It is not a weakly prime, because it can be changed into another prime (20981231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10490600 + 10490601.

It is an arithmetic number, because the mean of its divisors is an integer number (10490601).

Almost surely, 2^20981201 is an apocalyptic number.

It is an amenable number.

20981201 is a deficient number, since it is larger than the sum of its proper divisors (1).

20981201 is an equidigital number, since it uses as much as digits as its factorization.

20981201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 20981201 is about 4580.5240966509. The cubic root of 20981201 is about 275.8100676387.

The spelling of 20981201 in words is "twenty million, nine hundred eighty-one thousand, two hundred one".