20746256 has 40 divisors (see below), whose sum is σ = 43088760. Its totient is φ = 9641984.

The previous prime is 20746249. The next prime is 20746277. The reversal of 20746256 is 65264702.

It can be written as a sum of positive squares in 4 ways, for example, as 7203856 + 13542400 = 2684^2 + 3680^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23780 + ... + 24636.

It is an arithmetic number, because the mean of its divisors is an integer number (1077219).

Almost surely, 2^20746256 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 20746256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21544380).

20746256 is an abundant number, since it is smaller than the sum of its proper divisors (22342504).

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

20746256 is a wasteful number, since it uses less digits than its factorization.

20746256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971 (or 965 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 20746256 is about 4554.8058136434. The cubic root of 20746256 is about 274.7767046875.

The spelling of 20746256 in words is "twenty million, seven hundred forty-six thousand, two hundred fifty-six".