20321256 has 32 divisors (see below), whose sum is σ = 53792640. Its totient is φ = 6375168.

The previous prime is 20321243. The next prime is 20321261. The reversal of 20321256 is 65212302.

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, 24496 + ... + 25311.

It is an arithmetic number, because the mean of its divisors is an integer number (1681020).

Almost surely, 2^20321256 is an apocalyptic number.

It is an amenable number.

20321256 is an abundant number, since it is smaller than the sum of its proper divisors (33471384).

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

20321256 is a wasteful number, since it uses less digits than its factorization.

20321256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49833 (or 49829 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20321256 is about 4507.9103806531. The cubic root of 20321256 is about 272.8874202044.

Adding to 20321256 its reverse (65212302), we get a palindrome (85533558).

The spelling of 20321256 in words is "twenty million, three hundred twenty-one thousand, two hundred fifty-six".