19936161 has 24 divisors (see below), whose sum is σ = 33381504. Its totient is φ = 11229120.

The previous prime is 19936157. The next prime is 19936171. The reversal of 19936161 is 16163991.

It is not a de Polignac number, because 19936161 - 2² = 19936157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19936141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2245 + ... + 6701.

It is an arithmetic number, because the mean of its divisors is an integer number (1390896).

Almost surely, 2^19936161 is an apocalyptic number.

It is an amenable number.

19936161 is a deficient number, since it is larger than the sum of its proper divisors (13445343).

19936161 is a wasteful number, since it uses less digits than its factorization.

19936161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4541 (or 4538 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 19936161 is about 4464.9928331409. The cubic root of 19936161 is about 271.1526443145.

The spelling of 19936161 in words is "nineteen million, nine hundred thirty-six thousand, one hundred sixty-one".