19948813 has 8 divisors (see below), whose sum is σ = 20249856. Its totient is φ = 19650000.

The previous prime is 19948787. The next prime is 19948823. The reversal of 19948813 is 31884991.

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

It is a cyclic number.

It is not a de Polignac number, because 19948813 - 2¹³ = 19940621 is a prime.

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 19948813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19948823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26188 + ... + 26938.

It is an arithmetic number, because the mean of its divisors is an integer number (2531232).

Almost surely, 2^19948813 is an apocalyptic number.

It is an amenable number.

19948813 is a deficient number, since it is larger than the sum of its proper divisors (301043).

19948813 is a wasteful number, since it uses less digits than its factorization.

19948813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115.

The product of its digits is 62208, while the sum is 43.

The square root of 19948813 is about 4466.4094080145. The cubic root of 19948813 is about 271.2099923297.

The spelling of 19948813 in words is "nineteen million, nine hundred forty-eight thousand, eight hundred thirteen".