20828201 has 2 divisors, whose sum is σ = 20828202. Its totient is φ = 20828200.

The previous prime is 20828189. The next prime is 20828209. The reversal of 20828201 is 10282802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18284176 + 2544025 = 4276^2 + 1595^2 .

It is a cyclic number.

It is not a de Polignac number, because 20828201 - 2¹⁸ = 20566057 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20828209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10414100 + 10414101.

It is an arithmetic number, because the mean of its divisors is an integer number (10414101).

Almost surely, 2^20828201 is an apocalyptic number.

It is an amenable number.

20828201 is a deficient number, since it is larger than the sum of its proper divisors (1).

20828201 is an equidigital number, since it uses as much as digits as its factorization.

20828201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 20828201 is about 4563.7923922983. The cubic root of 20828201 is about 275.1380067638.

The spelling of 20828201 in words is "twenty million, eight hundred twenty-eight thousand, two hundred one".