20814819 has 8 divisors (see below), whose sum is σ = 27907152. Its totient is φ = 13799520.

The previous prime is 20814811. The next prime is 20814863. The reversal of 20814819 is 91841802.

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

It is not a de Polignac number, because 20814819 - 2³ = 20814811 is a prime.

It is a super-2 number, since 2×20814819² = 866513380005522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 20814819.

It is not an unprimeable number, because it can be changed into a prime (20814811) 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, 18624 + ... + 19709.

It is an arithmetic number, because the mean of its divisors is an integer number (3488394).

Almost surely, 2^20814819 is an apocalyptic number.

20814819 is a deficient number, since it is larger than the sum of its proper divisors (7092333).

20814819 is a wasteful number, since it uses less digits than its factorization.

20814819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38517.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 20814819 is about 4562.3260514786. The cubic root of 20814819 is about 275.0790692745.

The spelling of 20814819 in words is "twenty million, eight hundred fourteen thousand, eight hundred nineteen".