1243044020 has 48 divisors (see below), whose sum is σ = 2635416000. Its totient is φ = 492476160.

The previous prime is 1243044007. The next prime is 1243044041. The reversal of 1243044020 is 204403421.

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 = 1243043983 and 1243044001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1184456 + ... + 1185504.

It is an arithmetic number, because the mean of its divisors is an integer number (54904500).

Almost surely, 2^1243044020 is an apocalyptic number.

1243044020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243044020 is an abundant number, since it is smaller than the sum of its proper divisors (1392371980).

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

1243044020 is a wasteful number, since it uses less digits than its factorization.

1243044020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568 (or 1566 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1243044020 is about 35256.8294093499. The cubic root of 1243044020 is about 1075.2154664552.

Adding to 1243044020 its reverse (204403421), we get a palindrome (1447447441).

The spelling of 1243044020 in words is "one billion, two hundred forty-three million, forty-four thousand, twenty".