21428865

素因数分解:

$3^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{353}}^1$

素因数の和:454

約数の個数: 48

約数和(自身を含む): 39761280

約数和(自身を除く): 18332415

約数列:

[1, 3, 5, 9, 15, 19, 45, 57, 71, 95, 171, 213, 285, 353, 355, 639, 855, 1059, 1065, 1349, 1765, 3177, 3195, 4047, 5295, 6707, 6745, 12141, 15885, 20121, 20235, 25063, 33535, 60363, 60705, 75189, 100605, 125315, 225567, 301815, 375945, 476197, 1127835, 1428591, 2380985, 4285773, 7142955, 21428865]

約数ペア:

[(1, 21428865), (3, 7142955), (5, 4285773), (9, 2380985), (15, 1428591), (19, 1127835), (45, 476197), (57, 375945), (71, 301815), (95, 225567), (171, 125315), (213, 100605), (285, 75189), (353, 60705), (355, 60363), (639, 33535), (855, 25063), (1059, 20235), (1065, 20121), (1349, 15885), (1765, 12141), (3177, 6745), (3195, 6707), (4047, 5295)]