19620727144 has 8 divisors (see below), whose sum is σ = 36788863410. Its totient is φ = 9810363568.

The previous prime is 19620727081. The next prime is 19620727153. The reversal of 19620727144 is 44172702691.

It can be written as a sum of positive squares in only one way, i.e., 9970022500 + 9650704644 = 99850^2 + 98238^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 19620727144.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1226295439 + ... + 1226295454.

Almost surely, 2^19620727144 is an apocalyptic number.

It is an amenable number.

19620727144 is a deficient number, since it is larger than the sum of its proper divisors (17168136266).

19620727144 is a wasteful number, since it uses less digits than its factorization.

19620727144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452590899 (or 2452590895 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 19620727144 in words is "nineteen billion, six hundred twenty million, seven hundred twenty-seven thousand, one hundred forty-four".