19688970 has 128 divisors (see below), whose sum is σ = 57853440. Its totient is φ = 4193280.

The previous prime is 19688953. The next prime is 19688993. The reversal of 19688970 is 7988691.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 322740 + ... + 322800.

It is an arithmetic number, because the mean of its divisors is an integer number (451980).

Almost surely, 2^19688970 is an apocalyptic number.

19688970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19688970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28926720).

19688970 is an abundant number, since it is smaller than the sum of its proper divisors (38164470).

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

19688970 is a wasteful number, since it uses less digits than its factorization.

19688970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 19688970 is about 4437.2254844666. The cubic root of 19688970 is about 270.0272949086.

The spelling of 19688970 in words is "nineteen million, six hundred eighty-eight thousand, nine hundred seventy".