20081913 has 16 divisors (see below), whose sum is σ = 28475136. Its totient is φ = 12545280.

The previous prime is 20081911. The next prime is 20081939. The reversal of 20081913 is 31918002.

It is not a de Polignac number, because 20081913 - 2¹ = 20081911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20081911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13095 + ... + 14547.

It is an arithmetic number, because the mean of its divisors is an integer number (1779696).

Almost surely, 2^20081913 is an apocalyptic number.

It is an amenable number.

20081913 is a deficient number, since it is larger than the sum of its proper divisors (8393223).

20081913 is a wasteful number, since it uses less digits than its factorization.

20081913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 20081913 is about 4481.2847488192. The cubic root of 20081913 is about 271.8118337069.

Adding to 20081913 its reverse (31918002), we get a palindrome (51999915).

The spelling of 20081913 in words is "twenty million, eighty-one thousand, nine hundred thirteen".