20951201 has 2 divisors, whose sum is σ = 20951202. Its totient is φ = 20951200.

The previous prime is 20951197. The next prime is 20951209. The reversal of 20951201 is 10215902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11022400 + 9928801 = 3320^2 + 3151^2 .

It is a cyclic number.

It is not a de Polignac number, because 20951201 - 2² = 20951197 is a prime.

It is not a weakly prime, because it can be changed into another prime (20951209) 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, 10475600 + 10475601.

It is an arithmetic number, because the mean of its divisors is an integer number (10475601).

Almost surely, 2^20951201 is an apocalyptic number.

It is an amenable number.

20951201 is a deficient number, since it is larger than the sum of its proper divisors (1).

20951201 is an equidigital number, since it uses as much as digits as its factorization.

20951201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 20951201 is about 4577.2481907801. The cubic root of 20951201 is about 275.6785491293.

The spelling of 20951201 in words is "twenty million, nine hundred fifty-one thousand, two hundred one".