20924279 has 4 divisors (see below), whose sum is σ = 20933640. Its totient is φ = 20914920.

The previous prime is 20924269. The next prime is 20924311. The reversal of 20924279 is 97242902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20924279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20924249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 857 + ... + 6525.

It is an arithmetic number, because the mean of its divisors is an integer number (5233410).

Almost surely, 2^20924279 is an apocalyptic number.

20924279 is a deficient number, since it is larger than the sum of its proper divisors (9361).

20924279 is an equidigital number, since it uses as much as digits as its factorization.

20924279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9360.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20924279 is about 4574.3063955096. The cubic root of 20924279 is about 275.5604174902.

The spelling of 20924279 in words is "twenty million, nine hundred twenty-four thousand, two hundred seventy-nine".