19980837 has 20 divisors (see below), whose sum is σ = 31421280. Its totient is φ = 12618504.

The previous prime is 19980823. The next prime is 19980869. The reversal of 19980837 is 73808991.

It is not a de Polignac number, because 19980837 - 2¹⁴ = 19964453 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 19980792 and 19980801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19980887) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4953 + ... + 8030.

It is an arithmetic number, because the mean of its divisors is an integer number (1571064).

Almost surely, 2^19980837 is an apocalyptic number.

It is an amenable number.

19980837 is a deficient number, since it is larger than the sum of its proper divisors (11440443).

19980837 is a wasteful number, since it uses less digits than its factorization.

19980837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13014 (or 13005 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 19980837 is about 4469.9929530146. The cubic root of 19980837 is about 271.3550399815.

The spelling of 19980837 in words is "nineteen million, nine hundred eighty thousand, eight hundred thirty-seven".