1125540020 has 96 divisors (see below), whose sum is σ = 2651443200. Its totient is φ = 397837440.

The previous prime is 1125540011. The next prime is 1125540047. The reversal of 1125540020 is 200455211.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1125539974 and 1125540001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2057387 + ... + 2057933.

It is an arithmetic number, because the mean of its divisors is an integer number (27619200).

Almost surely, 2^1125540020 is an apocalyptic number.

1125540020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1125540020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1325721600).

1125540020 is an abundant number, since it is smaller than the sum of its proper divisors (1525903180).

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

1125540020 is a wasteful number, since it uses less digits than its factorization.

1125540020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813 (or 811 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1125540020 is about 33549.0688395371. The cubic root of 1125540020 is about 1040.2082977751.

Adding to 1125540020 its reverse (200455211), we get a palindrome (1325995231).

It can be divided in two parts, 1125 and 540020, that added together give a palindrome (541145).

The spelling of 1125540020 in words is "one billion, one hundred twenty-five million, five hundred forty thousand, twenty".