20542123 has 12 divisors (see below), whose sum is σ = 24091392. Its totient is φ = 17463600.

The previous prime is 20542099. The next prime is 20542153. The reversal of 20542123 is 32124502.

It is not a de Polignac number, because 20542123 - 2⁹ = 20541611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20542123.

It is not an unprimeable number, because it can be changed into a prime (20542153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4573 + ... + 7873.

It is an arithmetic number, because the mean of its divisors is an integer number (2007616).

Almost surely, 2^20542123 is an apocalyptic number.

20542123 is a deficient number, since it is larger than the sum of its proper divisors (3549269).

20542123 is a wasteful number, since it uses less digits than its factorization.

20542123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3442 (or 3435 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20542123 is about 4532.3418891341. The cubic root of 20542123 is about 273.8725098189.

Adding to 20542123 its reverse (32124502), we get a palindrome (52666625).

The spelling of 20542123 in words is "twenty million, five hundred forty-two thousand, one hundred twenty-three".