20620129 has 2 divisors, whose sum is σ = 20620130. Its totient is φ = 20620128.

The previous prime is 20620123. The next prime is 20620151. The reversal of 20620129 is 92102602.

It is a happy number.

It is an a-pointer prime, because the next prime (20620151) can be obtained adding 20620129 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18792225 + 1827904 = 4335^2 + 1352^2 .

It is a cyclic number.

It is not a de Polignac number, because 20620129 - 2⁵ = 20620097 is a prime.

It is not a weakly prime, because it can be changed into another prime (20620123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310064 + 10310065.

It is an arithmetic number, because the mean of its divisors is an integer number (10310065).

Almost surely, 2^20620129 is an apocalyptic number.

It is an amenable number.

20620129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20620129 is an equidigital number, since it uses as much as digits as its factorization.

20620129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20620129 is about 4540.9392200293. The cubic root of 20620129 is about 274.2187368368.

The spelling of 20620129 in words is "twenty million, six hundred twenty thousand, one hundred twenty-nine".