20100475242 has 64 divisors (see below), whose sum is σ = 45654336000. Its totient is φ = 6552394560.

The previous prime is 20100475201. The next prime is 20100475309. The reversal of 20100475242 is 24257400102.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 31 ways as a sum of consecutive naturals, for example, 4416384 + ... + 4420932.

It is an arithmetic number, because the mean of its divisors is an integer number (713349000).

Almost surely, 2^20100475242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20100475242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22827168000).

20100475242 is an abundant number, since it is smaller than the sum of its proper divisors (25553860758).

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

20100475242 is a wasteful number, since it uses less digits than its factorization.

20100475242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6348 (or 6342 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

Adding to 20100475242 its reverse (24257400102), we get a palindrome (44357875344).

The spelling of 20100475242 in words is "twenty billion, one hundred million, four hundred seventy-five thousand, two hundred forty-two".