20268556 has 96 divisors (see below), whose sum is σ = 48384000. Its totient is φ = 7338240.

The previous prime is 20268527. The next prime is 20268557. The reversal of 20268556 is 65586202.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20268557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 256525 + ... + 256603.

It is an arithmetic number, because the mean of its divisors is an integer number (504000).

Almost surely, 2^20268556 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 20268556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24192000).

20268556 is an abundant number, since it is smaller than the sum of its proper divisors (28115444).

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

20268556 is a wasteful number, since it uses less digits than its factorization.

20268556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 20268556 is about 4502.0613056688. The cubic root of 20268556 is about 272.6513190377.

The spelling of 20268556 in words is "twenty million, two hundred sixty-eight thousand, five hundred fifty-six".