208020931 has 2 divisors, whose sum is σ = 208020932. Its totient is φ = 208020930.

The previous prime is 208020929. The next prime is 208020977. The reversal of 208020931 is 139020802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 208020931 - 2¹ = 208020929 is a prime.

It is a super-2 number, since 2×208020931² = 86545415468213522, which contains 22 as substring.

Together with 208020929, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 208020896 and 208020905.

It is not a weakly prime, because it can be changed into another prime (208024931) 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, 104010465 + 104010466.

It is an arithmetic number, because the mean of its divisors is an integer number (104010466).

Almost surely, 2^208020931 is an apocalyptic number.

208020931 is a deficient number, since it is larger than the sum of its proper divisors (1).

208020931 is an equidigital number, since it uses as much as digits as its factorization.

208020931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 208020931 is about 14422.9307354643. The cubic root of 208020931 is about 592.5190873755.

The spelling of 208020931 in words is "two hundred eight million, twenty thousand, nine hundred thirty-one".