20205629 has 4 divisors (see below), whose sum is σ = 20635584. Its totient is φ = 19775676.

The previous prime is 20205623. The next prime is 20205697. The reversal of 20205629 is 92650202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20205629 - 2²⁴ = 3428413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20205598 and 20205607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214907 + ... + 215000.

It is an arithmetic number, because the mean of its divisors is an integer number (5158896).

Almost surely, 2^20205629 is an apocalyptic number.

It is an amenable number.

20205629 is a deficient number, since it is larger than the sum of its proper divisors (429955).

20205629 is an equidigital number, since it uses as much as digits as its factorization.

20205629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429954.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20205629 is about 4495.0671852599. The cubic root of 20205629 is about 272.3688631993.

The spelling of 20205629 in words is "twenty million, two hundred five thousand, six hundred twenty-nine".