19947520100 has 36 divisors (see below), whose sum is σ = 43879095204. Its totient is φ = 7869703680.

The previous prime is 19947520093. The next prime is 19947520111. The reversal of 19947520100 is 102574991.

It can be written as a sum of positive squares in 6 ways, for example, as 311663716 + 19635856384 = 17654^2 + 140128^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1358969 + ... + 1373568.

Almost surely, 2^19947520100 is an apocalyptic number.

19947520100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19947520100 is an abundant number, since it is smaller than the sum of its proper divisors (23931575104).

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

19947520100 is a wasteful number, since it uses less digits than its factorization.

19947520100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732624 (or 2732617 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 38.

The spelling of 19947520100 in words is "nineteen billion, nine hundred forty-seven million, five hundred twenty thousand, one hundred".