19998941 has 4 divisors (see below), whose sum is σ = 20007900. Its totient is φ = 19989984.

The previous prime is 19998917. The next prime is 19998943. The reversal of 19998941 is 14989991.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10824100 + 9174841 = 3290^2 + 3029^2 .

It is a cyclic number.

It is not a de Polignac number, because 19998941 - 2⁶ = 19998877 is a prime.

It is a super-2 number, since 2×19998941² = 799915282242962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19998941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1865 + ... + 6593.

It is an arithmetic number, because the mean of its divisors is an integer number (5001975).

Almost surely, 2^19998941 is an apocalyptic number.

It is an amenable number.

19998941 is a deficient number, since it is larger than the sum of its proper divisors (8959).

19998941 is an equidigital number, since it uses as much as digits as its factorization.

19998941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8958.

The product of its digits is 209952, while the sum is 50.

The square root of 19998941 is about 4472.0175536328. The cubic root of 19998941 is about 271.4369706278.

The spelling of 19998941 in words is "nineteen million, nine hundred ninety-eight thousand, nine hundred forty-one".