19621680 has 160 divisors (see below), whose sum is σ = 69162240. Its totient is φ = 4561920.

The previous prime is 19621673. The next prime is 19621697. The reversal of 19621680 is 8612691.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59115 + ... + 59445.

It is an arithmetic number, because the mean of its divisors is an integer number (432264).

Almost surely, 2^19621680 is an apocalyptic number.

19621680 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 19621680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34581120).

19621680 is an abundant number, since it is smaller than the sum of its proper divisors (49540560).

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

19621680 is a wasteful number, since it uses less digits than its factorization.

19621680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 19621680 is about 4429.6365539398. The cubic root of 19621680 is about 269.7193242397.

It can be divided in two parts, 19621 and 680, that added together give a triangular number (20301 = T₂₀₁).

The spelling of 19621680 in words is "nineteen million, six hundred twenty-one thousand, six hundred eighty".