20930251 has 2 divisors, whose sum is σ = 20930252. Its totient is φ = 20930250.

The previous prime is 20930243. The next prime is 20930269. The reversal of 20930251 is 15203902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20930251 - 2³ = 20930243 is a prime.

It is not a weakly prime, because it can be changed into another prime (20930201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10465125 + 10465126.

It is an arithmetic number, because the mean of its divisors is an integer number (10465126).

Almost surely, 2^20930251 is an apocalyptic number.

20930251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20930251 is an equidigital number, since it uses as much as digits as its factorization.

20930251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 20930251 is about 4574.9591255005. The cubic root of 20930251 is about 275.5866309028.

The spelling of 20930251 in words is "twenty million, nine hundred thirty thousand, two hundred fifty-one".