20100440730 has 64 divisors (see below), whose sum is σ = 49842524160. Its totient is φ = 5184599616.

The previous prime is 20100440677. The next prime is 20100440741. The reversal of 20100440730 is 3704400102.

It is a junction number, because it is equal to n+sod(n) for n = 20100440697 and 20100440706.

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, 57231 + ... + 208509.

It is an arithmetic number, because the mean of its divisors is an integer number (778789440).

Almost surely, 2^20100440730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20100440730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24921262080).

20100440730 is an abundant number, since it is smaller than the sum of its proper divisors (29742083430).

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

20100440730 is a wasteful number, since it uses less digits than its factorization.

20100440730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151435.

The product of its (nonzero) digits is 672, while the sum is 21.

Adding to 20100440730 its reverse (3704400102), we get a palindrome (23804840832).

The spelling of 20100440730 in words is "twenty billion, one hundred million, four hundred forty thousand, seven hundred thirty".