20256630 has 16 divisors (see below), whose sum is σ = 48615984. Its totient is φ = 5401760.

The previous prime is 20256619. The next prime is 20256631. The reversal of 20256630 is 3665202.

It is a self number, because there is not a number n which added to its sum of digits gives 20256630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337581 + ... + 337640.

It is an arithmetic number, because the mean of its divisors is an integer number (3038499).

Almost surely, 2^20256630 is an apocalyptic number.

20256630 is an abundant number, since it is smaller than the sum of its proper divisors (28359354).

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

20256630 is a wasteful number, since it uses less digits than its factorization.

20256630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675231.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20256630 is about 4500.7366063790. The cubic root of 20256630 is about 272.5978326161.

The spelling of 20256630 in words is "twenty million, two hundred fifty-six thousand, six hundred thirty".