19929700 has 72 divisors (see below), whose sum is σ = 50246784. Its totient is φ = 6720000.

The previous prime is 19929677. The next prime is 19929703. The reversal of 19929700 is 792991.

It is a self number, because there is not a number n which added to its sum of digits gives 19929700.

It is not an unprimeable number, because it can be changed into a prime (19929703) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49500 + ... + 49900.

It is an arithmetic number, because the mean of its divisors is an integer number (697872).

Almost surely, 2^19929700 is an apocalyptic number.

19929700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19929700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25123392).

19929700 is an abundant number, since it is smaller than the sum of its proper divisors (30317084).

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

19929700 is a wasteful number, since it uses less digits than its factorization.

19929700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 19929700 is about 4464.2692571125. The cubic root of 19929700 is about 271.1233490300.

The spelling of 19929700 in words is "nineteen million, nine hundred twenty-nine thousand, seven hundred".