19927680 has 128 divisors (see below), whose sum is σ = 64774080. Its totient is φ = 5210112.

The previous prime is 19927679. The next prime is 19927693. The reversal of 19927680 is 8672991.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×19927680² = 794224860364800, which contains 22 as substring.

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, 186187 + ... + 186293.

Almost surely, 2^19927680 is an apocalyptic number.

19927680 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 19927680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32387040).

19927680 is an abundant number, since it is smaller than the sum of its proper divisors (44846400).

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

19927680 is a wasteful number, since it uses less digits than its factorization.

19927680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 19927680 is about 4464.0430105455. The cubic root of 19927680 is about 271.1141887037.

The spelling of 19927680 in words is "nineteen million, nine hundred twenty-seven thousand, six hundred eighty".