19955280 has 160 divisors (see below), whose sum is σ = 67388544. Its totient is φ = 4866048.

The previous prime is 19955269. The next prime is 19955291. The reversal of 19955280 is 8255991.

It is an interprime number because it is at equal distance from previous prime (19955269) and next prime (19955291).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 273324 + ... + 273396.

Almost surely, 2^19955280 is an apocalyptic number.

19955280 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 19955280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33694272).

19955280 is an abundant number, since it is smaller than the sum of its proper divisors (47433264).

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

19955280 is a wasteful number, since it uses less digits than its factorization.

19955280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 19955280 is about 4467.1333089578. The cubic root of 19955280 is about 271.2392960871.

The spelling of 19955280 in words is "nineteen million, nine hundred fifty-five thousand, two hundred eighty".