19980040 has 32 divisors (see below), whose sum is σ = 45094680. Its totient is φ = 7967232.

The previous prime is 19980019. The next prime is 19980041. The reversal of 19980040 is 4008991.

It can be written as a sum of positive squares in 4 ways, for example, as 19873764 + 106276 = 4458^2 + 326^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19979984 and 19980011.

It is not an unprimeable number, because it can be changed into a prime (19980041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17734 + ... + 18826.

Almost surely, 2^19980040 is an apocalyptic number.

19980040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19980040 is an abundant number, since it is smaller than the sum of its proper divisors (25114640).

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

19980040 is a wasteful number, since it uses less digits than its factorization.

19980040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561 (or 1557 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 19980040 is about 4469.9038020969. The cubic root of 19980040 is about 271.3514319771.

The spelling of 19980040 in words is "nineteen million, nine hundred eighty thousand, forty".