265645020 has 24 divisors (see below), whose sum is σ = 743806224. Its totient is φ = 70838656.

The previous prime is 265645001. The next prime is 265645021. The reversal of 265645020 is 20546562.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265645021) by changing a digit.

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, 2213649 + ... + 2213768.

It is an arithmetic number, because the mean of its divisors is an integer number (30991926).

Almost surely, 2^265645020 is an apocalyptic number.

265645020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

265645020 is an abundant number, since it is smaller than the sum of its proper divisors (478161204).

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

265645020 is a wasteful number, since it uses less digits than its factorization.

265645020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4427429 (or 4427427 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 265645020 is about 16298.6201869974. The cubic root of 265645020 is about 642.8365469239.

The spelling of 265645020 in words is "two hundred sixty-five million, six hundred forty-five thousand, twenty".