19997310 has 32 divisors (see below), whose sum is σ = 50520960. Its totient is φ = 5051808.

The previous prime is 19997297. The next prime is 19997317. The reversal of 19997310 is 1379991.

It is a super-2 number, since 2×19997310² = 799784814472200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19997317) 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, 16972 + ... + 18111.

It is an arithmetic number, because the mean of its divisors is an integer number (1578780).

Almost surely, 2^19997310 is an apocalyptic number.

19997310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19997310 is an abundant number, since it is smaller than the sum of its proper divisors (30523650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19997310 is a wasteful number, since it uses less digits than its factorization.

19997310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35112.

The product of its (nonzero) digits is 15309, while the sum is 39.

The square root of 19997310 is about 4471.8351937432. The cubic root of 19997310 is about 271.4295914749.

The spelling of 19997310 in words is "nineteen million, nine hundred ninety-seven thousand, three hundred ten".