20533408 has 48 divisors (see below), whose sum is σ = 47706624. Its totient is φ = 8513280.

The previous prime is 20533391. The next prime is 20533427. The reversal of 20533408 is 80433502.

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, 5466 + ... + 8422.

It is an arithmetic number, because the mean of its divisors is an integer number (993888).

Almost surely, 2^20533408 is an apocalyptic number.

20533408 is a gapful number since it is divisible by the number (28) 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 20533408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23853312).

20533408 is an abundant number, since it is smaller than the sum of its proper divisors (27173216).

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

20533408 is a wasteful number, since it uses less digits than its factorization.

20533408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3005 (or 2997 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20533408 is about 4531.3803636420. The cubic root of 20533408 is about 273.8337741839.

The spelling of 20533408 in words is "twenty million, five hundred thirty-three thousand, four hundred eight".