20100281520 has 160 divisors (see below), whose sum is σ = 68025288960. Its totient is φ = 4869227520.

The previous prime is 20100281479. The next prime is 20100281569. The reversal of 20100281520 is 2518200102.

It is a happy number.

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, 6305367 + ... + 6308553.

It is an arithmetic number, because the mean of its divisors is an integer number (425158056).

Almost surely, 2^20100281520 is an apocalyptic number.

20100281520 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 20100281520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34012644480).

20100281520 is an abundant number, since it is smaller than the sum of its proper divisors (47925007440).

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

20100281520 is a wasteful number, since it uses less digits than its factorization.

20100281520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603 (or 5597 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 20100281520 its reverse (2518200102), we get a palindrome (22618481622).

The spelling of 20100281520 in words is "twenty billion, one hundred million, two hundred eighty-one thousand, five hundred twenty".