1261362020 has 24 divisors (see below), whose sum is σ = 2657229624. Its totient is φ = 502950656.

The previous prime is 1261362019. The next prime is 1261362029. The reversal of 1261362020 is 202631621.

It can be written as a sum of positive squares in 4 ways, for example, as 128097124 + 1133264896 = 11318^2 + 33664^2 .

It is not an unprimeable number, because it can be changed into a prime (1261362029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93137 + ... + 105816.

It is an arithmetic number, because the mean of its divisors is an integer number (110717901).

Almost surely, 2^1261362020 is an apocalyptic number.

1261362020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261362020 is an abundant number, since it is smaller than the sum of its proper divisors (1395867604).

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

1261362020 is a wasteful number, since it uses less digits than its factorization.

1261362020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199279 (or 199277 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1261362020 is about 35515.6588000279. The cubic root of 1261362020 is about 1080.4713363350.

Adding to 1261362020 its reverse (202631621), we get a palindrome (1463993641).

The spelling of 1261362020 in words is "one billion, two hundred sixty-one million, three hundred sixty-two thousand, twenty".