21320325

素因数分解:

$3^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{197}}^1$

素因数の和:263

約数の個数: 72

約数和(自身を含む): 42450408

約数和(自身を除く): 21130083

約数列:

[1, 3, 5, 9, 13, 15, 25, 37, 39, 45, 65, 75, 111, 117, 185, 195, 197, 225, 325, 333, 481, 555, 585, 591, 925, 975, 985, 1443, 1665, 1773, 2405, 2561, 2775, 2925, 2955, 4329, 4925, 7215, 7289, 7683, 8325, 8865, 12025, 12805, 14775, 21645, 21867, 23049, 36075, 36445, 38415, 44325, 64025, 65601, 94757, 108225, 109335, 115245, 182225, 192075, 284271, 328005, 473785, 546675, 576225, 852813, 1421355, 1640025, 2368925, 4264065, 7106775, 21320325]

約数ペア:

[(1, 21320325), (3, 7106775), (5, 4264065), (9, 2368925), (13, 1640025), (15, 1421355), (25, 852813), (37, 576225), (39, 546675), (45, 473785), (65, 328005), (75, 284271), (111, 192075), (117, 182225), (185, 115245), (195, 109335), (197, 108225), (225, 94757), (325, 65601), (333, 64025), (481, 44325), (555, 38415), (585, 36445), (591, 36075), (925, 23049), (975, 21867), (985, 21645), (1443, 14775), (1665, 12805), (1773, 12025), (2405, 8865), (2561, 8325), (2775, 7683), (2925, 7289), (2955, 7215), (4329, 4925)]