19951316 has 48 divisors (see below), whose sum is σ = 43878912. Its totient is φ = 7711200.

The previous prime is 19951313. The next prime is 19951339. The reversal of 19951316 is 61315991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19951313) 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, 64835 + ... + 65141.

It is an arithmetic number, because the mean of its divisors is an integer number (914144).

Almost surely, 2^19951316 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19951316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21939456).

19951316 is an abundant number, since it is smaller than the sum of its proper divisors (23927596).

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

19951316 is a wasteful number, since it uses less digits than its factorization.

19951316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540 (or 538 counting only the distinct ones).

The product of its digits is 7290, while the sum is 35.

The square root of 19951316 is about 4466.6896019312. The cubic root of 19951316 is about 271.2213348629.

It can be divided in two parts, 199 and 51316, that added together give a palindrome (51515).

The spelling of 19951316 in words is "nineteen million, nine hundred fifty-one thousand, three hundred sixteen".