19997270 has 32 divisors (see below), whose sum is σ = 38620800. Its totient is φ = 7428096.

The previous prime is 19997267. The next prime is 19997297. The reversal of 19997270 is 7279991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12686 + ... + 14174.

It is an arithmetic number, because the mean of its divisors is an integer number (1206900).

Almost surely, 2^19997270 is an apocalyptic number.

19997270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19997270 is a deficient number, since it is larger than the sum of its proper divisors (18623530).

19997270 is a wasteful number, since it uses less digits than its factorization.

19997270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1592.

The product of its (nonzero) digits is 71442, while the sum is 44.

The square root of 19997270 is about 4471.8307213042. The cubic root of 19997270 is about 271.4294104973.

The spelling of 19997270 in words is "nineteen million, nine hundred ninety-seven thousand, two hundred seventy".