20161290 has 16 divisors (see below), whose sum is σ = 48387168. Its totient is φ = 5376336.

The previous prime is 20161289. The next prime is 20161291. The reversal of 20161290 is 9216102.

It is an interprime number because it is at equal distance from previous prime (20161289) and next prime (20161291).

It is a super-2 number, since 2×20161290² = 812955228928200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20161291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335992 + ... + 336051.

It is an arithmetic number, because the mean of its divisors is an integer number (3024198).

Almost surely, 2^20161290 is an apocalyptic number.

20161290 is an abundant number, since it is smaller than the sum of its proper divisors (28225878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20161290 is a wasteful number, since it uses less digits than its factorization.

20161290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672053.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 20161290 is about 4490.1325147483. The cubic root of 20161290 is about 272.1694895929.

Adding to 20161290 its reverse (9216102), we get a palindrome (29377392).

The spelling of 20161290 in words is "twenty million, one hundred sixty-one thousand, two hundred ninety".