20457472 has 48 divisors (see below), whose sum is σ = 46781280. Its totient is φ = 8761344.

The previous prime is 20457461. The next prime is 20457473. The reversal of 20457472 is 27475402.

It is not an unprimeable number, because it can be changed into a prime (20457473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13623 + ... + 15049.

It is an arithmetic number, because the mean of its divisors is an integer number (974610).

Almost surely, 2^20457472 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 20457472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23390640).

20457472 is an abundant number, since it is smaller than the sum of its proper divisors (26323808).

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

20457472 is an equidigital number, since it uses as much as digits as its factorization.

20457472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456 (or 1436 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 31.

The square root of 20457472 is about 4522.9936988680. The cubic root of 20457472 is about 273.4957960734.

The spelling of 20457472 in words is "twenty million, four hundred fifty-seven thousand, four hundred seventy-two".