19944870 has 64 divisors (see below), whose sum is σ = 54984960. Its totient is φ = 4579200.

The previous prime is 19944863. The next prime is 19944877. The reversal of 19944870 is 7844991.

It is an interprime number because it is at equal distance from previous prime (19944863) and next prime (19944877).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19944877) 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 31 ways as a sum of consecutive naturals, for example, 4680 + ... + 7860.

It is an arithmetic number, because the mean of its divisors is an integer number (859140).

Almost surely, 2^19944870 is an apocalyptic number.

19944870 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 19944870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27492480).

19944870 is an abundant number, since it is smaller than the sum of its proper divisors (35040090).

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

19944870 is a wasteful number, since it uses less digits than its factorization.

19944870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3221.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 19944870 is about 4465.9679801808. The cubic root of 19944870 is about 271.1921224032.

The spelling of 19944870 in words is "nineteen million, nine hundred forty-four thousand, eight hundred seventy".