20011011240 has 128 divisors (see below), whose sum is σ = 65594603520. Its totient is φ = 4843449600.

The previous prime is 20011011227. The next prime is 20011011271. The reversal of 20011011240 is 4211011002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 842325 + ... + 865755.

It is an arithmetic number, because the mean of its divisors is an integer number (512457840).

Almost surely, 2^20011011240 is an apocalyptic number.

20011011240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20011011240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32797301760).

20011011240 is an abundant number, since it is smaller than the sum of its proper divisors (45583592280).

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

20011011240 is a wasteful number, since it uses less digits than its factorization.

20011011240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24103 (or 24099 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20011011240 its reverse (4211011002), we get a palindrome (24222022242).

The spelling of 20011011240 in words is "twenty billion, eleven million, eleven thousand, two hundred forty".