20711929 has 8 divisors (see below), whose sum is σ = 24248448. Its totient is φ = 17319840.

The previous prime is 20711909. The next prime is 20711941. The reversal of 20711929 is 92911702.

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 20711929 - 2¹⁵ = 20679161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20711929.

It is not an unprimeable number, because it can be changed into a prime (20711909) 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, 35797 + ... + 36370.

It is an arithmetic number, because the mean of its divisors is an integer number (3031056).

Almost surely, 2^20711929 is an apocalyptic number.

It is an amenable number.

20711929 is a deficient number, since it is larger than the sum of its proper divisors (3536519).

20711929 is an equidigital number, since it uses as much as digits as its factorization.

20711929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72215.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 20711929 is about 4551.0360358934. The cubic root of 20711929 is about 274.6250714326.

The spelling of 20711929 in words is "twenty million, seven hundred eleven thousand, nine hundred twenty-nine".