19808712 has 160 divisors (see below), whose sum is σ = 69347520. Its totient is φ = 5132160.

The previous prime is 19808707. The next prime is 19808717. The reversal of 19808712 is 21780891.

It is an interprime number because it is at equal distance from previous prime (19808707) and next prime (19808717).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (19808717) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 49698 + ... + 50094.

It is an arithmetic number, because the mean of its divisors is an integer number (433422).

Almost surely, 2^19808712 is an apocalyptic number.

19808712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19808712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34673760).

19808712 is an abundant number, since it is smaller than the sum of its proper divisors (49538808).

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

19808712 is a wasteful number, since it uses less digits than its factorization.

19808712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 19808712 is about 4450.6979227982. The cubic root of 19808712 is about 270.5735953902.

The spelling of 19808712 in words is "nineteen million, eight hundred eight thousand, seven hundred twelve".