20381115 has 8 divisors (see below), whose sum is σ = 32609808. Its totient is φ = 10869920.

The previous prime is 20381107. The next prime is 20381149. The reversal of 20381115 is 51118302.

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

It is not a de Polignac number, because 20381115 - 2³ = 20381107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20381091 and 20381100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 679356 + ... + 679385.

It is an arithmetic number, because the mean of its divisors is an integer number (4076226).

Almost surely, 2^20381115 is an apocalyptic number.

20381115 is a deficient number, since it is larger than the sum of its proper divisors (12228693).

20381115 is a wasteful number, since it uses less digits than its factorization.

20381115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358749.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 20381115 is about 4514.5448275546. The cubic root of 20381115 is about 273.1550997797.

Adding to 20381115 its reverse (51118302), we get a palindrome (71499417).

It can be divided in two parts, 203 and 81115, that added together give a palindrome (81318).

The spelling of 20381115 in words is "twenty million, three hundred eighty-one thousand, one hundred fifteen".