20265630 has 128 divisors (see below), whose sum is σ = 62816256. Its totient is φ = 4060800.

The previous prime is 20265629. The next prime is 20265667. The reversal of 20265630 is 3656202.

It is a self number, because there is not a number n which added to its sum of digits gives 20265630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 71469 + ... + 71751.

It is an arithmetic number, because the mean of its divisors is an integer number (490752).

Almost surely, 2^20265630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20265630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31408128).

20265630 is an abundant number, since it is smaller than the sum of its proper divisors (42550626).

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

20265630 is a wasteful number, since it uses less digits than its factorization.

20265630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342.

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

The square root of 20265630 is about 4501.7363316836. The cubic root of 20265630 is about 272.6381982846.

The spelling of 20265630 in words is "twenty million, two hundred sixty-five thousand, six hundred thirty".