20533448 has 32 divisors (see below), whose sum is σ = 41731200. Its totient is φ = 9415488.

The previous prime is 20533427. The next prime is 20533451. The reversal of 20533448 is 84433502.

It is a self number, because there is not a number n which added to its sum of digits gives 20533448.

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, 18065 + ... + 19167.

It is an arithmetic number, because the mean of its divisors is an integer number (1304100).

Almost surely, 2^20533448 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 20533448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20865600).

20533448 is an abundant number, since it is smaller than the sum of its proper divisors (21197752).

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

20533448 is a wasteful number, since it uses less digits than its factorization.

20533448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301 (or 1297 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 20533448 is about 4531.3847773059. The cubic root of 20533448 is about 273.8339519973.

The spelling of 20533448 in words is "twenty million, five hundred thirty-three thousand, four hundred forty-eight".