19929905 has 8 divisors (see below), whose sum is σ = 24321600. Its totient is φ = 15673456.

The previous prime is 19929901. The next prime is 19929929. The reversal of 19929905 is 50992991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19929905 - 2² = 19929901 is a prime.

It is a super-2 number, since 2×19929905² = 794402226618050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19929901) 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, 33485 + ... + 34074.

It is an arithmetic number, because the mean of its divisors is an integer number (3040200).

Almost surely, 2^19929905 is an apocalyptic number.

It is an amenable number.

19929905 is a deficient number, since it is larger than the sum of its proper divisors (4391695).

19929905 is an equidigital number, since it uses as much as digits as its factorization.

19929905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67623.

The product of its (nonzero) digits is 65610, while the sum is 44.

The square root of 19929905 is about 4464.2922171381. The cubic root of 19929905 is about 271.1242786325.

The spelling of 19929905 in words is "nineteen million, nine hundred twenty-nine thousand, nine hundred five".