19820020040 has 16 divisors (see below), whose sum is σ = 44595045180. Its totient is φ = 7928008000.

The previous prime is 19820019983. The next prime is 19820020067. The reversal of 19820020040 is 4002002891.

It can be written as a sum of positive squares in 2 ways, for example, as 19470853444 + 349166596 = 139538^2 + 18686^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19820019991 and 19820020009.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247750211 + ... + 247750290.

Almost surely, 2^19820020040 is an apocalyptic number.

19820020040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19820020040 is an abundant number, since it is smaller than the sum of its proper divisors (24775025140).

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

19820020040 is a wasteful number, since it uses less digits than its factorization.

19820020040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495500512 (or 495500508 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 19820020040 in words is "nineteen billion, eight hundred twenty million, twenty thousand, forty".