19939930 has 16 divisors (see below), whose sum is σ = 37781280. Its totient is φ = 7556112.

The previous prime is 19939901. The next prime is 19939943. The reversal of 19939930 is 3993991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52284 + ... + 52663.

It is an arithmetic number, because the mean of its divisors is an integer number (2361330).

Almost surely, 2^19939930 is an apocalyptic number.

19939930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19939930 is a deficient number, since it is larger than the sum of its proper divisors (17841350).

19939930 is a wasteful number, since it uses less digits than its factorization.

19939930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104973.

The product of its (nonzero) digits is 59049, while the sum is 43.

The square root of 19939930 is about 4465.4148743426. The cubic root of 19939930 is about 271.1697306854.

The spelling of 19939930 in words is "nineteen million, nine hundred thirty-nine thousand, nine hundred thirty".