20256210 has 128 divisors (see below), whose sum is σ = 60480000. Its totient is φ = 4790016.

The previous prime is 20256161. The next prime is 20256217. The reversal of 20256210 is 1265202.

20256210 is a `hidden beast` number, since 20 + 25 + 621 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20256217) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 101691 + ... + 101889.

It is an arithmetic number, because the mean of its divisors is an integer number (472500).

Almost surely, 2^20256210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20256210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30240000).

20256210 is an abundant number, since it is smaller than the sum of its proper divisors (40223790).

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

20256210 is a wasteful number, since it uses less digits than its factorization.

20256210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20256210 is about 4500.6899471081. The cubic root of 20256210 is about 272.5959485929.

The spelling of 20256210 in words is "twenty million, two hundred fifty-six thousand, two hundred ten".