19808064 has 70 divisors (see below), whose sum is σ = 58732674. Its totient is φ = 6600960.

The previous prime is 19808057. The next prime is 19808071. The reversal of 19808064 is 46080891.

It is a happy number.

19808064 is nontrivially palindromic in base 11.

It is an interprime number because it is at equal distance from previous prime (19808057) and next prime (19808071).

It can be written as a sum of positive squares in only one way, i.e., 19289664 + 518400 = 4392^2 + 720^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3274 + ... + 7094.

Almost surely, 2^19808064 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 19808064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29366337).

19808064 is an abundant number, since it is smaller than the sum of its proper divisors (38924610).

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

19808064 is an equidigital number, since it uses as much as digits as its factorization.

19808064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3845 (or 3826 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 19808064 is about 4450.6251246314. The cubic root of 19808064 is about 270.5706449442.

The spelling of 19808064 in words is "nineteen million, eight hundred eight thousand, sixty-four".