20290680 has 96 divisors (see below), whose sum is σ = 66549600. Its totient is φ = 5361408.

The previous prime is 20290661. The next prime is 20290693. The reversal of 20290680 is 8609202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56341 + ... + 56699.

It is an arithmetic number, because the mean of its divisors is an integer number (693225).

Almost surely, 2^20290680 is an apocalyptic number.

20290680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20290680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33274800).

20290680 is an abundant number, since it is smaller than the sum of its proper divisors (46258920).

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

20290680 is a wasteful number, since it uses less digits than its factorization.

20290680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533 (or 526 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20290680 is about 4504.5177322328. The cubic root of 20290680 is about 272.7504865089.

Adding to 20290680 its reverse (8609202), we get a palindrome (28899882).

The spelling of 20290680 in words is "twenty million, two hundred ninety thousand, six hundred eighty".