20228736 has 64 divisors (see below), whose sum is σ = 58629600. Its totient is φ = 6128640.

The previous prime is 20228729. The next prime is 20228737. The reversal of 20228736 is 63782202.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (20228737) 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, 1830 + ... + 6618.

Almost surely, 2^20228736 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 20228736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29314800).

20228736 is an abundant number, since it is smaller than the sum of its proper divisors (38400864).

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

20228736 is a wasteful number, since it uses less digits than its factorization.

20228736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4817 (or 4805 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20228736 is about 4497.6367127637. The cubic root of 20228736 is about 272.4726499498.

The spelling of 20228736 in words is "twenty million, two hundred twenty-eight thousand, seven hundred thirty-six".