19955140 has 24 divisors (see below), whose sum is σ = 42013440. Its totient is φ = 7961568.

The previous prime is 19955137. The next prime is 19955141. The reversal of 19955140 is 4155991.

It is a happy number.

It is a super-2 number, since 2×19955140² = 796415224839200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19955096 and 19955105.

It is not an unprimeable number, because it can be changed into a prime (19955141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8539 + ... + 10621.

It is an arithmetic number, because the mean of its divisors is an integer number (1750560).

Almost surely, 2^19955140 is an apocalyptic number.

19955140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19955140 is an abundant number, since it is smaller than the sum of its proper divisors (22058300).

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

19955140 is a wasteful number, since it uses less digits than its factorization.

19955140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571 (or 2569 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 19955140 is about 4467.1176389256. The cubic root of 19955140 is about 271.2386617756.

The spelling of 19955140 in words is "nineteen million, nine hundred fifty-five thousand, one hundred forty".