20906229 has 8 divisors (see below), whose sum is σ = 28042560. Its totient is φ = 13853696.

The previous prime is 20906227. The next prime is 20906233. The reversal of 20906229 is 92260902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20906229 - 2¹ = 20906227 is a prime.

It is a super-2 number, since 2×20906229² = 874140822000882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20906196 and 20906205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20906227) 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 7 ways as a sum of consecutive naturals, for example, 20364 + ... + 21365.

It is an arithmetic number, because the mean of its divisors is an integer number (3505320).

Almost surely, 2^20906229 is an apocalyptic number.

It is an amenable number.

20906229 is a deficient number, since it is larger than the sum of its proper divisors (7136331).

20906229 is a wasteful number, since it uses less digits than its factorization.

20906229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41899.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 20906229 is about 4572.3329931229. The cubic root of 20906229 is about 275.4811587428.

The spelling of 20906229 in words is "twenty million, nine hundred six thousand, two hundred twenty-nine".