19908164 has 6 divisors (see below), whose sum is σ = 34839294. Its totient is φ = 9954080.

The previous prime is 19908151. The next prime is 19908191. The reversal of 19908164 is 46180991.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10956100 + 8952064 = 3310^2 + 2992^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2488517 + ... + 2488524.

It is an arithmetic number, because the mean of its divisors is an integer number (5806549).

Almost surely, 2^19908164 is an apocalyptic number.

It is an amenable number.

19908164 is a deficient number, since it is larger than the sum of its proper divisors (14931130).

19908164 is a wasteful number, since it uses less digits than its factorization.

19908164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4977045 (or 4977043 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 19908164 is about 4461.8565642566. The cubic root of 19908164 is about 271.0256553554.

The spelling of 19908164 in words is "nineteen million, nine hundred eight thousand, one hundred sixty-four".