19729995 has 16 divisors (see below), whose sum is σ = 31624992. Its totient is φ = 10503680.

The previous prime is 19729993. The next prime is 19730003. The reversal of 19729995 is 59992791.

It is not a de Polignac number, because 19729995 - 2¹ = 19729993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19729993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12469 + ... + 13961.

It is an arithmetic number, because the mean of its divisors is an integer number (1976562).

Almost surely, 2^19729995 is an apocalyptic number.

19729995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19729995 is a deficient number, since it is larger than the sum of its proper divisors (11894997).

19729995 is a wasteful number, since it uses less digits than its factorization.

19729995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382.

The product of its digits is 459270, while the sum is 51.

The square root of 19729995 is about 4441.8459000735. The cubic root of 19729995 is about 270.2147126103.

The spelling of 19729995 in words is "nineteen million, seven hundred twenty-nine thousand, nine hundred ninety-five".