20009923 has 2 divisors, whose sum is σ = 20009924. Its totient is φ = 20009922.

The previous prime is 20009917. The next prime is 20009929. The reversal of 20009923 is 32990002.

It is a balanced prime because it is at equal distance from previous prime (20009917) and next prime (20009929).

It is a cyclic number.

It is not a de Polignac number, because 20009923 - 2⁹ = 20009411 is a prime.

It is not a weakly prime, because it can be changed into another prime (20009929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10004961 + 10004962.

It is an arithmetic number, because the mean of its divisors is an integer number (10004962).

Almost surely, 2^20009923 is an apocalyptic number.

20009923 is a deficient number, since it is larger than the sum of its proper divisors (1).

20009923 is an equidigital number, since it uses as much as digits as its factorization.

20009923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 20009923 is about 4473.2452425504. The cubic root of 20009923 is about 271.4866461805.

Adding to 20009923 its reverse (32990002), we get a palindrome (52999925).

The spelling of 20009923 in words is "twenty million, nine thousand, nine hundred twenty-three".