15697920 has 192 divisors, whose sum is σ = 58181760. Its totient is φ = 3538944.

The previous prime is 15697907. The next prime is 15697943. The reversal of 15697920 is 2979651.

It is a tau number, because it is divible by the number of its divisors (192).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215004 + ... + 215076.

It is an arithmetic number, because the mean of its divisors is an integer number (303030).

Almost surely, 2^15697920 is an apocalyptic number.

15697920 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 15697920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29090880).

15697920 is an abundant number, since it is smaller than the sum of its proper divisors (42483840).

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

15697920 is an equidigital number, since it uses as much as digits as its factorization.

15697920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 15697920 is about 3962.0600702160. The cubic root of 15697920 is about 250.3883032368.

The spelling of 15697920 in words is "fifteen million, six hundred ninety-seven thousand, nine hundred twenty".