1020243644 has 24 divisors (see below), whose sum is σ = 2160516960. Its totient is φ = 411526656.

The previous prime is 1020243643. The next prime is 1020243647. The reversal of 1020243644 is 4463420201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020243641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1071209 + ... + 1072160.

It is an arithmetic number, because the mean of its divisors is an integer number (90021540).

Almost surely, 2^1020243644 is an apocalyptic number.

1020243644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1020243644 is an abundant number, since it is smaller than the sum of its proper divisors (1140273316).

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

1020243644 is a wasteful number, since it uses less digits than its factorization.

1020243644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143397 (or 2143395 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 1020243644 is about 31941.2530123663. The cubic root of 1020243644 is about 1006.7028527163.

Adding to 1020243644 its reverse (4463420201), we get a palindrome (5483663845).

The spelling of 1020243644 in words is "one billion, twenty million, two hundred forty-three thousand, six hundred forty-four".