19447045920 has 192 divisors, whose sum is σ = 68266074240. Its totient is φ = 5170535424.

The previous prime is 19447045903. The next prime is 19447045949. The reversal of 19447045920 is 2954074491.

19447045920 is a `hidden beast` number, since 1 + 94 + 470 + 4 + 5 + 92 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1492554 + ... + 1505526.

It is an arithmetic number, because the mean of its divisors is an integer number (355552470).

Almost surely, 2^19447045920 is an apocalyptic number.

19447045920 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 19447045920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34133037120).

19447045920 is an abundant number, since it is smaller than the sum of its proper divisors (48819028320).

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

19447045920 is a wasteful number, since it uses less digits than its factorization.

19447045920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13344 (or 13330 counting only the distinct ones).

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

The spelling of 19447045920 in words is "nineteen billion, four hundred forty-seven million, forty-five thousand, nine hundred twenty".