20342123 has 2 divisors, whose sum is σ = 20342124. Its totient is φ = 20342122.

The previous prime is 20342093. The next prime is 20342129. The reversal of 20342123 is 32124302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20342123 - 2⁶ = 20342059 is a prime.

It is not a weakly prime, because it can be changed into another prime (20342129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10171061 + 10171062.

It is an arithmetic number, because the mean of its divisors is an integer number (10171062).

Almost surely, 2^20342123 is an apocalyptic number.

20342123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20342123 is an equidigital number, since it uses as much as digits as its factorization.

20342123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20342123 is about 4510.2242738028. The cubic root of 20342123 is about 272.9807935966.

Adding to 20342123 its reverse (32124302), we get a palindrome (52466425).

The spelling of 20342123 in words is "twenty million, three hundred forty-two thousand, one hundred twenty-three".