20102443240 has 64 divisors (see below), whose sum is σ = 50489904960. Its totient is φ = 7139973120.

The previous prime is 20102443219. The next prime is 20102443307. The reversal of 20102443240 is 4234420102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 512329 + ... + 550168.

It is an arithmetic number, because the mean of its divisors is an integer number (788904765).

Almost surely, 2^20102443240 is an apocalyptic number.

20102443240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20102443240 is an abundant number, since it is smaller than the sum of its proper divisors (30387461720).

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

20102443240 is a wasteful number, since it uses less digits than its factorization.

20102443240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062562 (or 1062558 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 20102443240 its reverse (4234420102), we get a palindrome (24336863342).

The spelling of 20102443240 in words is "twenty billion, one hundred two million, four hundred forty-three thousand, two hundred forty".