20999475

素因数分解:

$3^2\times 5^2\times 7^1\times {\mathrm{67}}^1\times {\mathrm{199}}^1$

素因数の和:289

約数の個数: 72

約数和(自身を含む): 43846400

約数和(自身を除く): 22846925

約数列:

[1, 3, 5, 7, 9, 15, 21, 25, 35, 45, 63, 67, 75, 105, 175, 199, 201, 225, 315, 335, 469, 525, 597, 603, 995, 1005, 1393, 1407, 1575, 1675, 1791, 2345, 2985, 3015, 4179, 4221, 4975, 5025, 6965, 7035, 8955, 11725, 12537, 13333, 14925, 15075, 20895, 21105, 34825, 35175, 39999, 44775, 62685, 66665, 93331, 104475, 105525, 119997, 199995, 279993, 313425, 333325, 466655, 599985, 839979, 999975, 1399965, 2333275, 2999925, 4199895, 6999825, 20999475]

約数ペア:

[(1, 20999475), (3, 6999825), (5, 4199895), (7, 2999925), (9, 2333275), (15, 1399965), (21, 999975), (25, 839979), (35, 599985), (45, 466655), (63, 333325), (67, 313425), (75, 279993), (105, 199995), (175, 119997), (199, 105525), (201, 104475), (225, 93331), (315, 66665), (335, 62685), (469, 44775), (525, 39999), (597, 35175), (603, 34825), (995, 21105), (1005, 20895), (1393, 15075), (1407, 14925), (1575, 13333), (1675, 12537), (1791, 11725), (2345, 8955), (2985, 7035), (3015, 6965), (4179, 5025), (4221, 4975)]