20280195 has 24 divisors (see below), whose sum is σ = 37857456. Its totient is φ = 9983808.

The previous prime is 20280191. The next prime is 20280217. The reversal of 20280195 is 59108202.

20280195 = 1243² + 1244² + ... + 1255².

It is not a de Polignac number, because 20280195 - 2² = 20280191 is a prime.

It is a super-2 number, since 2×20280195² = 822572618476050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20280191) 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 23 ways as a sum of consecutive naturals, for example, 16749 + ... + 17918.

It is an arithmetic number, because the mean of its divisors is an integer number (1577394).

Almost surely, 2^20280195 is an apocalyptic number.

20280195 is a deficient number, since it is larger than the sum of its proper divisors (17577261).

20280195 is a wasteful number, since it uses less digits than its factorization.

20280195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34691 (or 34688 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 20280195 is about 4503.3537502621. The cubic root of 20280195 is about 272.7034980791.

Adding to 20280195 its reverse (59108202), we get a palindrome (79388397).

The spelling of 20280195 in words is "twenty million, two hundred eighty thousand, one hundred ninety-five".