19729630 has 16 divisors (see below), whose sum is σ = 37057824. Its totient is φ = 7548640.

The previous prime is 19729627. The next prime is 19729631. The reversal of 19729630 is 3692791.

It is a self number, because there is not a number n which added to its sum of digits gives 19729630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19729631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42661 + ... + 43120.

It is an arithmetic number, because the mean of its divisors is an integer number (2316114).

Almost surely, 2^19729630 is an apocalyptic number.

19729630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19729630 is a deficient number, since it is larger than the sum of its proper divisors (17328194).

19729630 is a wasteful number, since it uses less digits than its factorization.

19729630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85811.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 19729630 is about 4441.8048133613. The cubic root of 19729630 is about 270.2130462984.

The spelling of 19729630 in words is "nineteen million, seven hundred twenty-nine thousand, six hundred thirty".