20209364 has 36 divisors (see below), whose sum is σ = 42938784. Its totient is φ = 8282736.

The previous prime is 20209339. The next prime is 20209367. The reversal of 20209364 is 46390202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20209367) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2267 + ... + 6749.

It is an arithmetic number, because the mean of its divisors is an integer number (1192744).

Almost surely, 2^20209364 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20209364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21469392).

20209364 is an abundant number, since it is smaller than the sum of its proper divisors (22729420).

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

20209364 is a wasteful number, since it uses less digits than its factorization.

20209364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4524 (or 4515 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20209364 is about 4495.4826214768. The cubic root of 20209364 is about 272.3856445795.

Adding to 20209364 its reverse (46390202), we get a palindrome (66599566).

The spelling of 20209364 in words is "twenty million, two hundred nine thousand, three hundred sixty-four".