20231856 has 100 divisors (see below), whose sum is σ = 59685912. Its totient is φ = 6614784.

The previous prime is 20231843. The next prime is 20231857. The reversal of 20231856 is 65813202.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20231857) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 86716 + ... + 86948.

Almost surely, 2^20231856 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 20231856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29842956).

20231856 is an abundant number, since it is smaller than the sum of its proper divisors (39454056).

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

20231856 is a wasteful number, since it uses less digits than its factorization.

20231856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20231856 is about 4497.9835482136. The cubic root of 20231856 is about 272.4866575966.

The spelling of 20231856 in words is "twenty million, two hundred thirty-one thousand, eight hundred fifty-six".