20481408 has 96 divisors (see below), whose sum is σ = 61579440. Its totient is φ = 6521856.

The previous prime is 20481403. The next prime is 20481451. The reversal of 20481408 is 80418402.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20481401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26110 + ... + 26882.

Almost surely, 2^20481408 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 20481408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30789720).

20481408 is an abundant number, since it is smaller than the sum of its proper divisors (41098032).

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

20481408 is a wasteful number, since it uses less digits than its factorization.

20481408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816 (or 801 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 20481408 is about 4525.6389604121. The cubic root of 20481408 is about 273.6024212364.

The spelling of 20481408 in words is "twenty million, four hundred eighty-one thousand, four hundred eight".