19928144331 has 24 divisors (see below), whose sum is σ = 29466630336. Its totient is φ = 12971130480.

The previous prime is 19928144329. The next prime is 19928144359. The reversal of 19928144331 is 13344182991.

19928144331 is a `hidden beast` number, since 19 + 92 + 81 + 443 + 31 = 666.

It is not a de Polignac number, because 19928144331 - 2¹ = 19928144329 is a prime.

It is a super-2 number, since 2×19928144331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19948144331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1075576 + ... + 1093946.

It is an arithmetic number, because the mean of its divisors is an integer number (1227776264).

Almost surely, 2^19928144331 is an apocalyptic number.

19928144331 is a deficient number, since it is larger than the sum of its proper divisors (9538486005).

19928144331 is a wasteful number, since it uses less digits than its factorization.

19928144331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21223 (or 21220 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The spelling of 19928144331 in words is "nineteen billion, nine hundred twenty-eight million, one hundred forty-four thousand, three hundred thirty-one".