20924929 has 4 divisors (see below), whose sum is σ = 20968384. Its totient is φ = 20881476.

The previous prime is 20924903. The next prime is 20924941. The reversal of 20924929 is 92942902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20924929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20924429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20997 + ... + 21970.

It is an arithmetic number, because the mean of its divisors is an integer number (5242096).

Almost surely, 2^20924929 is an apocalyptic number.

It is an amenable number.

20924929 is a deficient number, since it is larger than the sum of its proper divisors (43455).

20924929 is an equidigital number, since it uses as much as digits as its factorization.

20924929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43454.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20924929 is about 4574.3774439808. The cubic root of 20924929 is about 275.5632708329.

It can be divided in two parts, 2092 and 4929, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 20924929 in words is "twenty million, nine hundred twenty-four thousand, nine hundred twenty-nine".