19988205 has 8 divisors (see below), whose sum is σ = 31981152. Its totient is φ = 10660368.

The previous prime is 19988183. The next prime is 19988233. The reversal of 19988205 is 50288991.

It is a happy number.

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

It is not a de Polignac number, because 19988205 - 2⁸ = 19987949 is a prime.

It is a congruent number.

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, 666259 + ... + 666288.

It is an arithmetic number, because the mean of its divisors is an integer number (3997644).

Almost surely, 2^19988205 is an apocalyptic number.

19988205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19988205 is a deficient number, since it is larger than the sum of its proper divisors (11992947).

19988205 is a wasteful number, since it uses less digits than its factorization.

19988205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332555.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 19988205 is about 4470.8170394236. The cubic root of 19988205 is about 271.3883902399.

The spelling of 19988205 in words is "nineteen million, nine hundred eighty-eight thousand, two hundred five".