19797563 has 8 divisors (see below), whose sum is σ = 20912400. Its totient is φ = 18690048.

The previous prime is 19797551. The next prime is 19797581. The reversal of 19797563 is 36579791.

It is a happy number.

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 19797563 - 2¹² = 19793467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19797523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4283 + ... + 7611.

It is an arithmetic number, because the mean of its divisors is an integer number (2614050).

Almost surely, 2^19797563 is an apocalyptic number.

19797563 is a deficient number, since it is larger than the sum of its proper divisors (1114837).

19797563 is a wasteful number, since it uses less digits than its factorization.

19797563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3661.

The product of its digits is 357210, while the sum is 47.

The square root of 19797563 is about 4449.4452463200. The cubic root of 19797563 is about 270.5228232662.

The spelling of 19797563 in words is "nineteen million, seven hundred ninety-seven thousand, five hundred sixty-three".