261203020 has 36 divisors (see below), whose sum is σ = 593974080. Its totient is φ = 96442944.

The previous prime is 261203009. The next prime is 261203119. The reversal of 261203020 is 20302162.

It is a junction number, because it is equal to n+sod(n) for n = 261202985 and 261203003.

It is an unprimeable number.

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, 35260 + ... + 42019.

It is an arithmetic number, because the mean of its divisors is an integer number (16499280).

Almost surely, 2^261203020 is an apocalyptic number.

261203020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261203020 is an abundant number, since it is smaller than the sum of its proper divisors (332771060).

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

261203020 is a wasteful number, since it uses less digits than its factorization.

261203020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77314 (or 77299 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 261203020 is about 16161.7765112626. The cubic root of 261203020 is about 639.2333104247.

Adding to 261203020 its reverse (20302162), we get a palindrome (281505182).

The spelling of 261203020 in words is "two hundred sixty-one million, two hundred three thousand, twenty".