20437728 has 48 divisors (see below), whose sum is σ = 54907776. Its totient is φ = 6652800.

The previous prime is 20437717. The next prime is 20437733. The reversal of 20437728 is 82773402.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1653 + ... + 6603.

It is an arithmetic number, because the mean of its divisors is an integer number (1143912).

Almost surely, 2^20437728 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 20437728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27453888).

20437728 is an abundant number, since it is smaller than the sum of its proper divisors (34470048).

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

20437728 is a wasteful number, since it uses less digits than its factorization.

20437728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5007 (or 4999 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 20437728 is about 4520.8105467936. The cubic root of 20437728 is about 273.4077819545.

The spelling of 20437728 in words is "twenty million, four hundred thirty-seven thousand, seven hundred twenty-eight".