15668920 has 64 divisors (see below), whose sum is σ = 37908000. Its totient is φ = 5810688.

The previous prime is 15668909. The next prime is 15668921. The reversal of 15668920 is 2986651.

It is a self number, because there is not a number n which added to its sum of digits gives 15668920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15668921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40086 + ... + 40474.

Almost surely, 2^15668920 is an apocalyptic number.

15668920 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 15668920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18954000).

15668920 is an abundant number, since it is smaller than the sum of its proper divisors (22239080).

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

15668920 is a wasteful number, since it uses less digits than its factorization.

15668920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 468 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 15668920 is about 3958.3986661275. The cubic root of 15668920 is about 250.2340208686.

The spelling of 15668920 in words is "fifteen million, six hundred sixty-eight thousand, nine hundred twenty".