19906464 has 48 divisors (see below), whose sum is σ = 53948160. Its totient is φ = 6420480.

The previous prime is 19906457. The next prime is 19906489. The reversal of 19906464 is 46460991.

It is a tau number, because it is divible by the number of its divisors (48).

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, 369 + ... + 6320.

It is an arithmetic number, because the mean of its divisors is an integer number (1123920).

Almost surely, 2^19906464 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 19906464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26974080).

19906464 is an abundant number, since it is smaller than the sum of its proper divisors (34041696).

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

19906464 is a wasteful number, since it uses less digits than its factorization.

19906464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6733 (or 6725 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 19906464 is about 4461.6660565309. Note that the first 3 decimals coincide. The cubic root of 19906464 is about 271.0179406522.

The spelling of 19906464 in words is "nineteen million, nine hundred six thousand, four hundred sixty-four".