20929123 has 4 divisors (see below), whose sum is σ = 21604288. Its totient is φ = 20253960.

The previous prime is 20929121. The next prime is 20929141. The reversal of 20929123 is 32192902.

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

It is a cyclic number.

It is not a de Polignac number, because 20929123 - 2¹ = 20929121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20929091 and 20929100.

It is not an unprimeable number, because it can be changed into a prime (20929121) 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, 337536 + ... + 337597.

It is an arithmetic number, because the mean of its divisors is an integer number (5401072).

Almost surely, 2^20929123 is an apocalyptic number.

20929123 is a deficient number, since it is larger than the sum of its proper divisors (675165).

20929123 is an equidigital number, since it uses as much as digits as its factorization.

20929123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675164.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20929123 is about 4574.8358440495. The cubic root of 20929123 is about 275.5816800575.

The spelling of 20929123 in words is "twenty million, nine hundred twenty-nine thousand, one hundred twenty-three".