19723930 has 16 divisors (see below), whose sum is σ = 35953920. Its totient is φ = 7789392.

The previous prime is 19723901. The next prime is 19723933. The reversal of 19723930 is 3932791.

It is not an unprimeable number, because it can be changed into a prime (19723933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11694 + ... + 13273.

It is an arithmetic number, because the mean of its divisors is an integer number (2247120).

Almost surely, 2^19723930 is an apocalyptic number.

19723930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19723930 is a deficient number, since it is larger than the sum of its proper divisors (16229990).

19723930 is a wasteful number, since it uses less digits than its factorization.

19723930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25053.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 19723930 is about 4441.1631359364. The cubic root of 19723930 is about 270.1870217740.

The spelling of 19723930 in words is "nineteen million, seven hundred twenty-three thousand, nine hundred thirty".