20820203 has 2 divisors, whose sum is σ = 20820204. Its totient is φ = 20820202.

The previous prime is 20820193. The next prime is 20820211. The reversal of 20820203 is 30202802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20820203 - 2⁶ = 20820139 is a prime.

It is a super-2 number, since 2×20820203² = 866961705922418, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20810203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10410101 + 10410102.

It is an arithmetic number, because the mean of its divisors is an integer number (10410102).

Almost surely, 2^20820203 is an apocalyptic number.

20820203 is a deficient number, since it is larger than the sum of its proper divisors (1).

20820203 is an equidigital number, since it uses as much as digits as its factorization.

20820203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20820203 is about 4562.9160632210. The cubic root of 20820203 is about 275.1027847186.

The spelling of 20820203 in words is "twenty million, eight hundred twenty thousand, two hundred three".