19955560 has 32 divisors (see below), whose sum is σ = 45752040. Its totient is φ = 7830784.

The previous prime is 19955549. The next prime is 19955581. The reversal of 19955560 is 6555991.

It can be written as a sum of positive squares in 4 ways, for example, as 19945156 + 10404 = 4466^2 + 102^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2587 + ... + 6826.

Almost surely, 2^19955560 is an apocalyptic number.

19955560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19955560 is an abundant number, since it is smaller than the sum of its proper divisors (25796480).

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

19955560 is a wasteful number, since it uses less digits than its factorization.

19955560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9477 (or 9473 counting only the distinct ones).

The product of its (nonzero) digits is 60750, while the sum is 40.

The square root of 19955560 is about 4467.1646488573. The cubic root of 19955560 is about 271.2405647011.

The spelling of 19955560 in words is "nineteen million, nine hundred fifty-five thousand, five hundred sixty".