20135123 has 8 divisors (see below), whose sum is σ = 21475440. Its totient is φ = 18812160.

The previous prime is 20135113. The next prime is 20135147. The reversal of 20135123 is 32153102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20135123 - 2²⁰ = 19086547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20135113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1898 + ... + 6623.

It is an arithmetic number, because the mean of its divisors is an integer number (2684430).

Almost surely, 2^20135123 is an apocalyptic number.

20135123 is a deficient number, since it is larger than the sum of its proper divisors (1340317).

20135123 is a wasteful number, since it uses less digits than its factorization.

20135123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8677.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 20135123 is about 4487.2177348553. The cubic root of 20135123 is about 272.0516905438.

Adding to 20135123 its reverse (32153102), we get a palindrome (52288225).

The spelling of 20135123 in words is "twenty million, one hundred thirty-five thousand, one hundred twenty-three".