15920240 has 40 divisors (see below), whose sum is σ = 42303840. Its totient is φ = 5458176.

The previous prime is 15920239. The next prime is 15920243. The reversal of 15920240 is 4202951.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15920243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13655 + ... + 14774.

It is an arithmetic number, because the mean of its divisors is an integer number (1057596).

Almost surely, 2^15920240 is an apocalyptic number.

15920240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15920240 is an abundant number, since it is smaller than the sum of its proper divisors (26383600).

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

15920240 is a wasteful number, since it uses less digits than its factorization.

15920240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28449 (or 28443 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 15920240 is about 3990.0175438211. The cubic root of 15920240 is about 251.5647985207.

The spelling of 15920240 in words is "fifteen million, nine hundred twenty thousand, two hundred forty".