20209580 has 24 divisors (see below), whose sum is σ = 42650160. Its totient is φ = 8043840.

The previous prime is 20209561. The next prime is 20209591. The reversal of 20209580 is 8590202.

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, 1826 + ... + 6614.

It is an arithmetic number, because the mean of its divisors is an integer number (1777090).

Almost surely, 2^20209580 is an apocalyptic number.

20209580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20209580 is an abundant number, since it is smaller than the sum of its proper divisors (22440580).

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

20209580 is a wasteful number, since it uses less digits than its factorization.

20209580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5009 (or 5007 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 20209580 is about 4495.5066455295. The cubic root of 20209580 is about 272.3866150057.

Adding to 20209580 its reverse (8590202), we get a palindrome (28799782).

The spelling of 20209580 in words is "twenty million, two hundred nine thousand, five hundred eighty".