20958151 has 2 divisors, whose sum is σ = 20958152. Its totient is φ = 20958150.

The previous prime is 20958107. The next prime is 20958163. The reversal of 20958151 is 15185902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20958151 - 2⁷ = 20958023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20958101) 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, 10479075 + 10479076.

It is an arithmetic number, because the mean of its divisors is an integer number (10479076).

Almost surely, 2^20958151 is an apocalyptic number.

20958151 is a deficient number, since it is larger than the sum of its proper divisors (1).

20958151 is an equidigital number, since it uses as much as digits as its factorization.

20958151 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 20958151 is about 4578.0073176001. The cubic root of 20958151 is about 275.7090287519.

The spelling of 20958151 in words is "twenty million, nine hundred fifty-eight thousand, one hundred fifty-one".