20123136 has 120 divisors (see below), whose sum is σ = 63516024. Its totient is φ = 6082560.

The previous prime is 20123119. The next prime is 20123141. The reversal of 20123136 is 63132102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50490 + ... + 50886.

Almost surely, 2^20123136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20123136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31758012).

20123136 is an abundant number, since it is smaller than the sum of its proper divisors (43392888).

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

20123136 is a wasteful number, since it uses less digits than its factorization.

20123136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20123136 is about 4485.8818531031. The cubic root of 20123136 is about 271.9976931754.

Adding to 20123136 its reverse (63132102), we get a palindrome (83255238).

The spelling of 20123136 in words is "twenty million, one hundred twenty-three thousand, one hundred thirty-six".