Base | Representation |
---|---|
bin | 10011100100111000… |
… | …111100011011100100 |
3 | 2000020220211201222100 |
4 | 103210320330123210 |
5 | 321022110031040 |
6 | 13353443332100 |
7 | 1342616032503 |
oct | 234470743344 |
9 | 60226751870 |
10 | 21020002020 |
11 | 8a072746a6 |
12 | 40a7681030 |
13 | 1c9cac9124 |
14 | 103595c83a |
15 | 83059db30 |
hex | 4e4e3c6e4 |
21020002020 has 36 divisors (see below), whose sum is σ = 63760673340. Its totient is φ = 5605333824.
The previous prime is 21020002001. The next prime is 21020002063. The reversal of 21020002020 is 2020002012.
It can be written as a sum of positive squares in 2 ways, for example, as 13835405376 + 7184596644 = 117624^2 + 84762^2 .
It is a tau number, because it is divible by the number of its divisors (36).
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a junction number, because it is equal to n+sod(n) for n = 21020001993 and 21020002011.
It is an unprimeable number.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58388715 + ... + 58389074.
It is an arithmetic number, because the mean of its divisors is an integer number (1771129815).
Almost surely, 221020002020 is an apocalyptic number.
21020002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
21020002020 is an abundant number, since it is smaller than the sum of its proper divisors (42740671320).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21020002020 is a wasteful number, since it uses less digits than its factorization.
21020002020 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 116777804 (or 116777799 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 9.
Adding to 21020002020 its reverse (2020002012), we get a palindrome (23040004032).
The spelling of 21020002020 in words is "twenty-one billion, twenty million, two thousand, twenty".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.067 sec. • engine limits •