20702929 has 4 divisors (see below), whose sum is σ = 22295476. Its totient is φ = 19110384.

The previous prime is 20702911. The next prime is 20702971. The reversal of 20702929 is 92920702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5531904 + 15171025 = 2352^2 + 3895^2 .

It is a cyclic number.

It is not a de Polignac number, because 20702929 - 2²¹ = 18605777 is a prime.

It is a super-3 number, since 3×20702929³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20702929.

It is not an unprimeable number, because it can be changed into a prime (20702329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 796254 + ... + 796279.

It is an arithmetic number, because the mean of its divisors is an integer number (5573869).

Almost surely, 2^20702929 is an apocalyptic number.

It is an amenable number.

20702929 is a deficient number, since it is larger than the sum of its proper divisors (1592547).

20702929 is a wasteful number, since it uses less digits than its factorization.

20702929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592546.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 20702929 is about 4550.0471426129. The cubic root of 20702929 is about 274.5852878578.

The spelling of 20702929 in words is "twenty million, seven hundred two thousand, nine hundred twenty-nine".