20453472 has 120 divisors (see below), whose sum is σ = 64886976. Its totient is φ = 6283008.

The previous prime is 20453453. The next prime is 20453473. The reversal of 20453472 is 27435402.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20453473) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 33393 + ... + 33999.

Almost surely, 2^20453472 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 20453472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32443488).

20453472 is an abundant number, since it is smaller than the sum of its proper divisors (44433504).

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

20453472 is a wasteful number, since it uses less digits than its factorization.

20453472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

The square root of 20453472 is about 4522.5514922442. The cubic root of 20453472 is about 273.4779695878.

Adding to 20453472 its reverse (27435402), we get a palindrome (47888874).

The spelling of 20453472 in words is "twenty million, four hundred fifty-three thousand, four hundred seventy-two".