20630129 has 16 divisors (see below), whose sum is σ = 23678928. Its totient is φ = 17805312.

The previous prime is 20630123. The next prime is 20630147. The reversal of 20630129 is 92103602.

It can be written as a sum of positive squares in 8 ways, for example, as 2371600 + 18258529 = 1540^2 + 4273^2 .

It is a cyclic number.

It is not a de Polignac number, because 20630129 - 2²⁴ = 3852913 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20630123) 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 in 15 ways as a sum of consecutive naturals, for example, 61049 + ... + 61385.

It is an arithmetic number, because the mean of its divisors is an integer number (1479933).

Almost surely, 2^20630129 is an apocalyptic number.

It is an amenable number.

20630129 is a deficient number, since it is larger than the sum of its proper divisors (3048799).

20630129 is a wasteful number, since it uses less digits than its factorization.

20630129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20630129 is about 4542.0401803595. The cubic root of 20630129 is about 274.2630583216.

The spelling of 20630129 in words is "twenty million, six hundred thirty thousand, one hundred twenty-nine".