21003895

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{97}}^1\times {\mathrm{127}}^1$

素因数の和:271

約数の個数: 32

約数和(自身を含む): 28901376

約数和(自身を除く): 7897481

約数列:

[1, 5, 11, 31, 55, 97, 127, 155, 341, 485, 635, 1067, 1397, 1705, 3007, 3937, 5335, 6985, 12319, 15035, 19685, 33077, 43307, 61595, 135509, 165385, 216535, 381889, 677545, 1909445, 4200779, 21003895]

約数ペア:

[(1, 21003895), (5, 4200779), (11, 1909445), (31, 677545), (55, 381889), (97, 216535), (127, 165385), (155, 135509), (341, 61595), (485, 43307), (635, 33077), (1067, 19685), (1397, 15035), (1705, 12319), (3007, 6985), (3937, 5335)]