20225436 has 144 divisors (see below), whose sum is σ = 62052480. Its totient is φ = 5066880.

The previous prime is 20225419. The next prime is 20225477. The reversal of 20225436 is 63452202.

It is a super-2 number, since 2×20225436² = 818136522780192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 342775 + ... + 342833.

It is an arithmetic number, because the mean of its divisors is an integer number (430920).

Almost surely, 2^20225436 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 20225436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31026240).

20225436 is an abundant number, since it is smaller than the sum of its proper divisors (41827044).

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

20225436 is a wasteful number, since it uses less digits than its factorization.

20225436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20225436 is about 4497.2698384687. The cubic root of 20225436 is about 272.4578326021.

Adding to 20225436 its reverse (63452202), we get a palindrome (83677638).

It can be divided in two parts, 20 and 225436, that added together give a triangular number (225456 = T₆₇₁).

The spelling of 20225436 in words is "twenty million, two hundred twenty-five thousand, four hundred thirty-six".