20912929 has 8 divisors (see below), whose sum is σ = 21288960. Its totient is φ = 20540016.

The previous prime is 20912923. The next prime is 20912989. The reversal of 20912929 is 92921902.

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 20912929 - 2⁵ = 20912897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20912894 and 20912903.

It is not an unprimeable number, because it can be changed into a prime (20912923) 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, 15712 + ... + 16990.

It is an arithmetic number, because the mean of its divisors is an integer number (2661120).

Almost surely, 2^20912929 is an apocalyptic number.

It is an amenable number.

20912929 is a deficient number, since it is larger than the sum of its proper divisors (376031).

20912929 is a wasteful number, since it uses less digits than its factorization.

20912929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1559.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 20912929 is about 4573.0656019786. The cubic root of 20912929 is about 275.5105842094.

The spelling of 20912929 in words is "twenty million, nine hundred twelve thousand, nine hundred twenty-nine".