265215220 has 24 divisors (see below), whose sum is σ = 557381664. Its totient is φ = 106004256.

The previous prime is 265215217. The next prime is 265215241. The reversal of 265215220 is 22512562.

It is a happy number.

It is a super-2 number, since 2×265215220² = 140678225839296800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26107 + ... + 34813.

It is an arithmetic number, because the mean of its divisors is an integer number (23224236).

Almost surely, 2^265215220 is an apocalyptic number.

265215220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

265215220 is an abundant number, since it is smaller than the sum of its proper divisors (292166444).

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

265215220 is a wasteful number, since it uses less digits than its factorization.

265215220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10239 (or 10237 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 265215220 is about 16285.4296842300. The cubic root of 265215220 is about 642.4896676057.

Adding to 265215220 its reverse (22512562), we get a palindrome (287727782).

The spelling of 265215220 in words is "two hundred sixty-five million, two hundred fifteen thousand, two hundred twenty".