19666956 has 12 divisors (see below), whose sum is σ = 45889592. Its totient is φ = 6555648.

The previous prime is 19666939. The next prime is 19666963. The reversal of 19666956 is 65966691.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 819445 + ... + 819468.

Almost surely, 2^19666956 is an apocalyptic number.

It is an amenable number.

19666956 is an abundant number, since it is smaller than the sum of its proper divisors (26222636).

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

19666956 is a wasteful number, since it uses less digits than its factorization.

19666956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638920 (or 1638918 counting only the distinct ones).

The product of its digits is 524880, while the sum is 48.

The square root of 19666956 is about 4434.7441865343. The cubic root of 19666956 is about 269.9266192902.

The spelling of 19666956 in words is "nineteen million, six hundred sixty-six thousand, nine hundred fifty-six".