19980726 has 8 divisors (see below), whose sum is σ = 39961464. Its totient is φ = 6660240.

The previous prime is 19980713. The next prime is 19980743. The reversal of 19980726 is 62708991.

It is a sphenic number, since it is the product of 3 distinct primes.

19980726 is an admirable number.

It is a super-2 number, since 2×19980726² = 798458822974152, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1665055 + ... + 1665066.

It is an arithmetic number, because the mean of its divisors is an integer number (4995183).

Almost surely, 2^19980726 is an apocalyptic number.

19980726 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19980726 is a wasteful number, since it uses less digits than its factorization.

19980726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330126.

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

The square root of 19980726 is about 4469.9805368704. The cubic root of 19980726 is about 271.3545374923.

It can be divided in two parts, 19980 and 726, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 19980726 in words is "nineteen million, nine hundred eighty thousand, seven hundred twenty-six".