Base | Representation |
---|---|
bin | 101001111011… |
… | …0010110010000 |
3 | 1112100201122211 |
4 | 1103312112100 |
5 | 21111334220 |
6 | 2103041504 |
7 | 354555160 |
oct | 123662620 |
9 | 45321584 |
10 | 21980560 |
11 | 11453358 |
12 | 7440294 |
13 | 4727a64 |
14 | 2cc25a0 |
15 | 1de2b5a |
hex | 14f6590 |
21980560 has 40 divisors (see below), whose sum is σ = 58406976. Its totient is φ = 7536000.
The previous prime is 21980513. The next prime is 21980561. The reversal of 21980560 is 6508912.
It is a tau number, because it is divible by the number of its divisors (40).
It is not an unprimeable number, because it can be changed into a prime (21980561) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19066 + ... + 20185.
Almost surely, 221980560 is an apocalyptic number.
21980560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
21980560 is an abundant number, since it is smaller than the sum of its proper divisors (36426416).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21980560 is a wasteful number, since it uses less digits than its factorization.
21980560 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 39271 (or 39265 counting only the distinct ones).
The product of its (nonzero) digits is 4320, while the sum is 31.
The square root of 21980560 is about 4688.3429908657. The cubic root of 21980560 is about 280.1213759491.
The spelling of 21980560 in words is "twenty-one million, nine hundred eighty thousand, five hundred sixty".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.077 sec. • engine limits •