19727203540 has 96 divisors (see below), whose sum is σ = 45922681728. Its totient is φ = 7117510400.

The previous prime is 19727203537. The next prime is 19727203541. The reversal of 19727203540 is 4530272791.

It is a junction number, because it is equal to n+sod(n) for n = 19727203493 and 19727203502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19727203541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3484392 + ... + 3490048.

It is an arithmetic number, because the mean of its divisors is an integer number (478361268).

Almost surely, 2^19727203540 is an apocalyptic number.

19727203540 is a gapful number since it is divisible by the number (10) 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 19727203540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22961340864).

19727203540 is an abundant number, since it is smaller than the sum of its proper divisors (26195478188).

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

19727203540 is a wasteful number, since it uses less digits than its factorization.

19727203540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5830 (or 5806 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 19727203540 in words is "nineteen billion, seven hundred twenty-seven million, two hundred three thousand, five hundred forty".