20381719 has 4 divisors (see below), whose sum is σ = 20393640. Its totient is φ = 20369800.

The previous prime is 20381717. The next prime is 20381731. The reversal of 20381719 is 91718302.

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 is a cyclic number.

It is not a de Polignac number, because 20381719 - 2¹ = 20381717 is a prime.

It is a super-2 number, since 2×20381719² = 830828938789922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20381717) 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, 2857 + ... + 6994.

It is an arithmetic number, because the mean of its divisors is an integer number (5098410).

Almost surely, 2^20381719 is an apocalyptic number.

20381719 is a deficient number, since it is larger than the sum of its proper divisors (11921).

20381719 is an equidigital number, since it uses as much as digits as its factorization.

20381719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11920.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 20381719 is about 4514.6117219535. The cubic root of 20381719 is about 273.1577980955.

The spelling of 20381719 in words is "twenty million, three hundred eighty-one thousand, seven hundred nineteen".