20293123 has 4 divisors (see below), whose sum is σ = 20311488. Its totient is φ = 20274760.

The previous prime is 20293111. The next prime is 20293139. The reversal of 20293123 is 32139202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20293123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20293094 and 20293103.

It is not an unprimeable number, because it can be changed into a prime (20293103) 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, 7411 + ... + 9772.

It is an arithmetic number, because the mean of its divisors is an integer number (5077872).

Almost surely, 2^20293123 is an apocalyptic number.

20293123 is a deficient number, since it is larger than the sum of its proper divisors (18365).

20293123 is a wasteful number, since it uses less digits than its factorization.

20293123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18364.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20293123 is about 4504.7888962747. The cubic root of 20293123 is about 272.7614324653.

The spelling of 20293123 in words is "twenty million, two hundred ninety-three thousand, one hundred twenty-three".