19945170 has 128 divisors (see below), whose sum is σ = 62138880. Its totient is φ = 4458240.

The previous prime is 19945153. The next prime is 19945171. The reversal of 19945170 is 7154991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19945171) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 115204 + ... + 115376.

It is an arithmetic number, because the mean of its divisors is an integer number (485460).

Almost surely, 2^19945170 is an apocalyptic number.

19945170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19945170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31069440).

19945170 is an abundant number, since it is smaller than the sum of its proper divisors (42193710).

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

19945170 is a wasteful number, since it uses less digits than its factorization.

19945170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 19945170 is about 4466.0015673978. The cubic root of 19945170 is about 271.1934821051.

It can be divided in two parts, 199 and 45170, that added together give a square (45369 = 213²).

The spelling of 19945170 in words is "nineteen million, nine hundred forty-five thousand, one hundred seventy".