20028736 has 112 divisors (see below), whose sum is σ = 51775360. Its totient is φ = 7464960.

The previous prime is 20028731. The next prime is 20028739. The reversal of 20028736 is 63782002.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20028731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110566 + ... + 110746.

It is an arithmetic number, because the mean of its divisors is an integer number (462280).

Almost surely, 2^20028736 is an apocalyptic number.

20028736 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20028736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25887680).

20028736 is an abundant number, since it is smaller than the sum of its proper divisors (31746624).

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

20028736 is a wasteful number, since it uses less digits than its factorization.

20028736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20028736 is about 4475.3475842665. The cubic root of 20028736 is about 271.5717019543.

The spelling of 20028736 in words is "twenty million, twenty-eight thousand, seven hundred thirty-six".