20393472 has 160 divisors (see below), whose sum is σ = 63638784. Its totient is φ = 5734400.

The previous prime is 20393447. The next prime is 20393473. The reversal of 20393472 is 27439302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20393473) 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, 287197 + ... + 287267.

Almost surely, 2^20393472 is an apocalyptic number.

20393472 is a gapful number since it is divisible by the number (22) 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 20393472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31819392).

20393472 is an abundant number, since it is smaller than the sum of its proper divisors (43245312).

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

20393472 is a wasteful number, since it uses less digits than its factorization.

20393472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 20393472 is about 4515.9131966857. The cubic root of 20393472 is about 273.2102929596.

The spelling of 20393472 in words is "twenty million, three hundred ninety-three thousand, four hundred seventy-two".