19965393280 has 64 divisors (see below), whose sum is σ = 54548318880. Its totient is φ = 6845276160.

The previous prime is 19965393241. The next prime is 19965393307. The reversal of 19965393280 is 8239356991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2223801 + ... + 2232760.

Almost surely, 2^19965393280 is an apocalyptic number.

19965393280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19965393280 is an abundant number, since it is smaller than the sum of its proper divisors (34582925600).

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

19965393280 is an equidigital number, since it uses as much as digits as its factorization.

19965393280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4456587 (or 4456575 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 55.

The spelling of 19965393280 in words is "nineteen billion, nine hundred sixty-five million, three hundred ninety-three thousand, two hundred eighty".