21057255

素因数分解:

$3^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{12647}}^1$

素因数の和:12695

約数の個数: 24

約数和(自身を含む): 37488672

約数和(自身を除く): 16431417

約数列:

[1, 3, 5, 9, 15, 37, 45, 111, 185, 333, 555, 1665, 12647, 37941, 63235, 113823, 189705, 467939, 569115, 1403817, 2339695, 4211451, 7019085, 21057255]

約数ペア:

[(1, 21057255), (3, 7019085), (5, 4211451), (9, 2339695), (15, 1403817), (37, 569115), (45, 467939), (111, 189705), (185, 113823), (333, 63235), (555, 37941), (1665, 12647)]