19949520 has 80 divisors (see below), whose sum is σ = 62531712. Its totient is φ = 5260800.

The previous prime is 19949497. The next prime is 19949537. The reversal of 19949520 is 2594991.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 23829 + ... + 24651.

Almost surely, 2^19949520 is an apocalyptic number.

19949520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19949520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31265856).

19949520 is an abundant number, since it is smaller than the sum of its proper divisors (42582192).

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

19949520 is a wasteful number, since it uses less digits than its factorization.

19949520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940 (or 934 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 19949520 is about 4466.4885536627. The cubic root of 19949520 is about 271.2131962497.

The spelling of 19949520 in words is "nineteen million, nine hundred forty-nine thousand, five hundred twenty".