19942180 has 12 divisors (see below), whose sum is σ = 41878620. Its totient is φ = 7976864.

The previous prime is 19942129. The next prime is 19942187. The reversal of 19942180 is 8124991.

It can be written as a sum of positive squares in 2 ways, for example, as 7706176 + 12236004 = 2776^2 + 3498^2 .

It is not an unprimeable number, because it can be changed into a prime (19942187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498535 + ... + 498574.

It is an arithmetic number, because the mean of its divisors is an integer number (3489885).

Almost surely, 2^19942180 is an apocalyptic number.

19942180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19942180 is an abundant number, since it is smaller than the sum of its proper divisors (21936440).

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

19942180 is a wasteful number, since it uses less digits than its factorization.

19942180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997118 (or 997116 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 19942180 is about 4465.6668035132. Note that the first 3 decimals coincide. The cubic root of 19942180 is about 271.1799298009.

The spelling of 19942180 in words is "nineteen million, nine hundred forty-two thousand, one hundred eighty".