19708243650 has 120 divisors (see below), whose sum is σ = 57981082500. Its totient is φ = 4946365440.

The previous prime is 19708243631. The next prime is 19708243679. The reversal of 19708243650 is 5634280791.

19708243650 is a `hidden beast` number, since 1 + 97 + 0 + 82 + 436 + 50 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 6076046601 + 13632197049 = 77949^2 + 116757^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 19708243596 and 19708243605.

It is an unprimeable number.

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 59 ways as a sum of consecutive naturals, for example, 74275 + ... + 211974.

It is a 1-persistent number, because it is pandigital, but 2⋅19708243650 = 39416487300 is not.

Almost surely, 2^19708243650 is an apocalyptic number.

19708243650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19708243650 is an abundant number, since it is smaller than the sum of its proper divisors (38272838850).

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

19708243650 is a wasteful number, since it uses less digits than its factorization.

19708243650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286290 (or 286276 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 19708243650 in words is "nineteen billion, seven hundred eight million, two hundred forty-three thousand, six hundred fifty".