19664960 has 56 divisors (see below), whose sum is σ = 53522880. Its totient is φ = 6741504.

The previous prime is 19664951. The next prime is 19664993. The reversal of 19664960 is 6946691.

It is a tau number, because it is divible by the number of its divisors (56).

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, 2150 + ... + 6629.

Almost surely, 2^19664960 is an apocalyptic number.

19664960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19664960 is an abundant number, since it is smaller than the sum of its proper divisors (33857920).

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

19664960 is an equidigital number, since it uses as much as digits as its factorization.

19664960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8803 (or 8793 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 19664960 is about 4434.5191396588. The cubic root of 19664960 is about 269.9174873608.

It can be divided in two parts, 19664 and 960, that multiplied together give a triangular number (18877440 = T₆₁₄₄).

The spelling of 19664960 in words is "nineteen million, six hundred sixty-four thousand, nine hundred sixty".