20355136 has 56 divisors (see below), whose sum is σ = 42281856. Its totient is φ = 9715200.

The previous prime is 20355133. The next prime is 20355149. The reversal of 20355136 is 63155302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20355136.

It is not an unprimeable number, because it can be changed into a prime (20355133) 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, 201486 + ... + 201586.

Almost surely, 2^20355136 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 20355136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21140928).

20355136 is an abundant number, since it is smaller than the sum of its proper divisors (21926720).

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

20355136 is a wasteful number, since it uses less digits than its factorization.

20355136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 20355136 is about 4511.6666543529. Note that the first 4 decimals coincide. The cubic root of 20355136 is about 273.0389904371.

The spelling of 20355136 in words is "twenty million, three hundred fifty-five thousand, one hundred thirty-six".