20231136 has 72 divisors (see below), whose sum is σ = 57985200. Its totient is φ = 6690816.

The previous prime is 20231129. The next prime is 20231137. The reversal of 20231136 is 63113202.

It is a tau number, because it is divible by the number of its divisors (72).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20231137) 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, 57136 + ... + 57488.

It is an arithmetic number, because the mean of its divisors is an integer number (805350).

Almost surely, 2^20231136 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 20231136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28992600).

20231136 is an abundant number, since it is smaller than the sum of its proper divisors (37754064).

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

20231136 is a wasteful number, since it uses less digits than its factorization.

20231136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568 (or 557 counting only the distinct ones).

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

The square root of 20231136 is about 4497.9035116374. The cubic root of 20231136 is about 272.4834251906.

Adding to 20231136 its reverse (63113202), we get a palindrome (83344338).

The spelling of 20231136 in words is "twenty million, two hundred thirty-one thousand, one hundred thirty-six".