20403208 has 96 divisors (see below), whose sum is σ = 48591360. Its totient is φ = 7983360.

The previous prime is 20403197. The next prime is 20403221. The reversal of 20403208 is 80230402.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 279460 + ... + 279532.

It is an arithmetic number, because the mean of its divisors is an integer number (506160).

Almost surely, 2^20403208 is an apocalyptic number.

20403208 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 20403208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24295680).

20403208 is an abundant number, since it is smaller than the sum of its proper divisors (28188152).

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

20403208 is a wasteful number, since it uses less digits than its factorization.

20403208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20403208 is about 4516.9910338631. The cubic root of 20403208 is about 273.2537636059.

The spelling of 20403208 in words is "twenty million, four hundred three thousand, two hundred eight".