20433408 has 80 divisors (see below), whose sum is σ = 55683936. Its totient is φ = 6656000.

The previous prime is 20433403. The next prime is 20433409. The reversal of 20433408 is 80433402.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (20433403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81283 + ... + 81533.

Almost surely, 2^20433408 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 20433408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27841968).

20433408 is an abundant number, since it is smaller than the sum of its proper divisors (35250528).

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

20433408 is an equidigital number, since it uses as much as digits as its factorization.

20433408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 20433408 is about 4520.3327311162. The cubic root of 20433408 is about 273.3885168508.

The spelling of 20433408 in words is "twenty million, four hundred thirty-three thousand, four hundred eight".