21208425

素因数分解:

$3^1\times 5^2\times 7^2\times {\mathrm{29}}^1\times {\mathrm{199}}^1$

素因数の和:255

約数の個数: 72

約数和(自身を含む): 42408000

約数和(自身を除く): 21199575

約数列:

[1, 3, 5, 7, 15, 21, 25, 29, 35, 49, 75, 87, 105, 145, 147, 175, 199, 203, 245, 435, 525, 597, 609, 725, 735, 995, 1015, 1225, 1393, 1421, 2175, 2985, 3045, 3675, 4179, 4263, 4975, 5075, 5771, 6965, 7105, 9751, 14925, 15225, 17313, 20895, 21315, 28855, 29253, 34825, 35525, 40397, 48755, 86565, 104475, 106575, 121191, 144275, 146265, 201985, 243775, 282779, 432825, 605955, 731325, 848337, 1009925, 1413895, 3029775, 4241685, 7069475, 21208425]

約数ペア:

[(1, 21208425), (3, 7069475), (5, 4241685), (7, 3029775), (15, 1413895), (21, 1009925), (25, 848337), (29, 731325), (35, 605955), (49, 432825), (75, 282779), (87, 243775), (105, 201985), (145, 146265), (147, 144275), (175, 121191), (199, 106575), (203, 104475), (245, 86565), (435, 48755), (525, 40397), (597, 35525), (609, 34825), (725, 29253), (735, 28855), (995, 21315), (1015, 20895), (1225, 17313), (1393, 15225), (1421, 14925), (2175, 9751), (2985, 7105), (3045, 6965), (3675, 5771), (4179, 5075), (4263, 4975)]