20858147 has 2 divisors, whose sum is σ = 20858148. Its totient is φ = 20858146.

The previous prime is 20858119. The next prime is 20858153. The reversal of 20858147 is 74185802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20858147 - 2⁸ = 20857891 is a prime.

It is not a weakly prime, because it can be changed into another prime (20858107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429073 + 10429074.

It is an arithmetic number, because the mean of its divisors is an integer number (10429074).

Almost surely, 2^20858147 is an apocalyptic number.

20858147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20858147 is an equidigital number, since it uses as much as digits as its factorization.

20858147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 20858147 is about 4567.0720379692. The cubic root of 20858147 is about 275.2698046275.

The spelling of 20858147 in words is "twenty million, eight hundred fifty-eight thousand, one hundred forty-seven".