20123137 has 4 divisors (see below), whose sum is σ = 20998080. Its totient is φ = 19248196.

The previous prime is 20123119. The next prime is 20123141. The reversal of 20123137 is 73132102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20123137 - 2¹⁹ = 19598849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20123177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437437 + ... + 437482.

It is an arithmetic number, because the mean of its divisors is an integer number (5249520).

Almost surely, 2^20123137 is an apocalyptic number.

It is an amenable number.

20123137 is a deficient number, since it is larger than the sum of its proper divisors (874943).

20123137 is an equidigital number, since it uses as much as digits as its factorization.

20123137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874942.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 20123137 is about 4485.8819645639. The cubic root of 20123137 is about 271.9976976809.

Adding to 20123137 its reverse (73132102), we get a palindrome (93255239).

The spelling of 20123137 in words is "twenty million, one hundred twenty-three thousand, one hundred thirty-seven".