20730123 has 24 divisors (see below), whose sum is σ = 31943808. Its totient is φ = 12909312.

The previous prime is 20730119. The next prime is 20730131. The reversal of 20730123 is 32103702.

It is not a de Polignac number, because 20730123 - 2² = 20730119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20730096 and 20730105.

It is not an unprimeable number, because it can be changed into a prime (20730173) 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 23 ways as a sum of consecutive naturals, for example, 23590 + ... + 24452.

It is an arithmetic number, because the mean of its divisors is an integer number (1330992).

Almost surely, 2^20730123 is an apocalyptic number.

20730123 is a deficient number, since it is larger than the sum of its proper divisors (11213685).

20730123 is a wasteful number, since it uses less digits than its factorization.

20730123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043 (or 1040 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 20730123 is about 4553.0344826280. The cubic root of 20730123 is about 274.7054609548.

Adding to 20730123 its reverse (32103702), we get a palindrome (52833825).

The spelling of 20730123 in words is "twenty million, seven hundred thirty thousand, one hundred twenty-three".