20290147 has 2 divisors, whose sum is σ = 20290148. Its totient is φ = 20290146.

The previous prime is 20290139. The next prime is 20290183. The reversal of 20290147 is 74109202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20290147 - 2³ = 20290139 is a prime.

It is not a weakly prime, because it can be changed into another prime (20290447) 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, 10145073 + 10145074.

It is an arithmetic number, because the mean of its divisors is an integer number (10145074).

Almost surely, 2^20290147 is an apocalyptic number.

20290147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20290147 is an equidigital number, since it uses as much as digits as its factorization.

20290147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20290147 is about 4504.4585690180. The cubic root of 20290147 is about 272.7480982649.

Adding to 20290147 its reverse (74109202), we get a palindrome (94399349).

The spelling of 20290147 in words is "twenty million, two hundred ninety thousand, one hundred forty-seven".