20123538 has 32 divisors (see below), whose sum is σ = 41549760. Its totient is φ = 6493440.

The previous prime is 20123513. The next prime is 20123539. The reversal of 20123538 is 83532102.

It is not an unprimeable number, because it can be changed into a prime (20123539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43806 + ... + 44262.

It is an arithmetic number, because the mean of its divisors is an integer number (1298430).

Almost surely, 2^20123538 is an apocalyptic number.

20123538 is an abundant number, since it is smaller than the sum of its proper divisors (21426222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20123538 is a wasteful number, since it uses less digits than its factorization.

20123538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20123538 is about 4485.9266601227. The cubic root of 20123538 is about 271.9995043964. Note that the first 3 decimals are identical.

The spelling of 20123538 in words is "twenty million, one hundred twenty-three thousand, five hundred thirty-eight".