20193819 has 4 divisors (see below), whose sum is σ = 26925096. Its totient is φ = 13462544.

The previous prime is 20193799. The next prime is 20193863. The reversal of 20193819 is 91839102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20193819 - 2¹⁷ = 20062747 is a prime.

It is a super-2 number, since 2×20193819² = 815580651609522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20193819.

It is not an unprimeable number, because it can be changed into a prime (20193119) 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, 3365634 + ... + 3365639.

It is an arithmetic number, because the mean of its divisors is an integer number (6731274).

Almost surely, 2^20193819 is an apocalyptic number.

20193819 is a deficient number, since it is larger than the sum of its proper divisors (6731277).

20193819 is an equidigital number, since it uses as much as digits as its factorization.

20193819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6731276.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 20193819 is about 4493.7533310141. The cubic root of 20193819 is about 272.3157871780.

It can be divided in two parts, 20193 and 819, that added together give a palindrome (21012).

The spelling of 20193819 in words is "twenty million, one hundred ninety-three thousand, eight hundred nineteen".