20105511250 has 60 divisors (see below), whose sum is σ = 41423513670. Its totient is φ = 7311040000.

The previous prime is 20105511229. The next prime is 20105511253. The reversal of 20105511250 is 5211550102.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 1117498041 + 18988013209 = 33429^2 + 137797^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20105511253) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 84786 + ... + 217714.

Almost surely, 2^20105511250 is an apocalyptic number.

20105511250 is an abundant number, since it is smaller than the sum of its proper divisors (21318002420).

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

20105511250 is a wasteful number, since it uses less digits than its factorization.

20105511250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132973 (or 132947 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

The spelling of 20105511250 in words is "twenty billion, one hundred five million, five hundred eleven thousand, two hundred fifty".