20209192 has 24 divisors (see below), whose sum is σ = 40256910. Its totient is φ = 9509120.

The previous prime is 20209169. The next prime is 20209199. The reversal of 20209192 is 29190202.

It can be written as a sum of positive squares in 3 ways, for example, as 18783556 + 1425636 = 4334^2 + 1194^2 .

It is a super-2 number, since 2×20209192² = 816822882585728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20209199) 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 5 ways as a sum of consecutive naturals, for example, 2059 + ... + 6682.

Almost surely, 2^20209192 is an apocalyptic number.

It is an amenable number.

20209192 is a deficient number, since it is larger than the sum of its proper divisors (20047718).

20209192 is a wasteful number, since it uses less digits than its factorization.

20209192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8781 (or 8760 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 20209192 is about 4495.4634911208. The cubic root of 20209192 is about 272.3848718277.

Adding to 20209192 its reverse (29190202), we get a palindrome (49399394).

The spelling of 20209192 in words is "twenty million, two hundred nine thousand, one hundred ninety-two".