19988670 has 64 divisors (see below), whose sum is σ = 52254720. Its totient is φ = 4864128.

The previous prime is 19988653. The next prime is 19988671. The reversal of 19988670 is 7688991.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19988671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41491 + ... + 41969.

It is an arithmetic number, because the mean of its divisors is an integer number (816480).

Almost surely, 2^19988670 is an apocalyptic number.

19988670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19988670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26127360).

19988670 is an abundant number, since it is smaller than the sum of its proper divisors (32266050).

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

19988670 is a wasteful number, since it uses less digits than its factorization.

19988670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 19988670 is about 4470.8690430385. The cubic root of 19988670 is about 271.3904947247.

The spelling of 19988670 in words is "nineteen million, nine hundred eighty-eight thousand, six hundred seventy".