20868029 has 16 divisors (see below), whose sum is σ = 26285952. Its totient is φ = 16123968.

The previous prime is 20868019. The next prime is 20868059. The reversal of 20868029 is 92086802.

It is not a de Polignac number, because 20868029 - 2⁸ = 20867773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20868029.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20868019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1247 + ... + 6579.

It is an arithmetic number, because the mean of its divisors is an integer number (1642872).

Almost surely, 2^20868029 is an apocalyptic number.

It is an amenable number.

20868029 is a deficient number, since it is larger than the sum of its proper divisors (5417923).

20868029 is a wasteful number, since it uses less digits than its factorization.

20868029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5396.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 20868029 is about 4568.1537846268. The cubic root of 20868029 is about 275.3132694462.

The spelling of 20868029 in words is "twenty million, eight hundred sixty-eight thousand, twenty-nine".