20540256 has 96 divisors (see below), whose sum is σ = 60092928. Its totient is φ = 6090240.

The previous prime is 20540251. The next prime is 20540279. The reversal of 20540256 is 65204502.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540251) 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, 55785 + ... + 56151.

It is an arithmetic number, because the mean of its divisors is an integer number (625968).

Almost surely, 2^20540256 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 20540256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30046464).

20540256 is an abundant number, since it is smaller than the sum of its proper divisors (39552672).

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

20540256 is a wasteful number, since it uses less digits than its factorization.

20540256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20540256 is about 4532.1359202919. The cubic root of 20540256 is about 273.8642124703.

Adding to 20540256 its reverse (65204502), we get a palindrome (85744758).

The spelling of 20540256 in words is "twenty million, five hundred forty thousand, two hundred fifty-six".