19988370 has 40 divisors (see below), whose sum is σ = 53748684. Its totient is φ = 5330016.

The previous prime is 19988369. The next prime is 19988377. The reversal of 19988370 is 7388991.

It can be written as a sum of positive squares in 2 ways, for example, as 19686969 + 301401 = 4437^2 + 549^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (19988377) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11529 + ... + 13148.

Almost surely, 2^19988370 is an apocalyptic number.

19988370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19988370 is an abundant number, since it is smaller than the sum of its proper divisors (33760314).

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

19988370 is a wasteful number, since it uses less digits than its factorization.

19988370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24696 (or 24687 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 19988370 is about 4470.8354923884. The cubic root of 19988370 is about 271.3891369963.

The spelling of 19988370 in words is "nineteen million, nine hundred eighty-eight thousand, three hundred seventy".