21001890

素因数分解:

$2^1\times 3^1\times 5^1\times 7^3\times {\mathrm{13}}^1\times {\mathrm{157}}^1$

素因数の和:201

約数の個数: 128

約数和(自身を含む): 63705600

約数和(自身を除く): 42703710

約数列:

[1, 2, 3, 5, 6, 7, 10, 13, 14, 15, 21, 26, 30, 35, 39, 42, 49, 65, 70, 78, 91, 98, 105, 130, 147, 157, 182, 195, 210, 245, 273, 294, 314, 343, 390, 455, 471, 490, 546, 637, 686, 735, 785, 910, 942, 1029, 1099, 1274, 1365, 1470, 1570, 1715, 1911, 2041, 2058, 2198, 2355, 2730, 3185, 3297, 3430, 3822, 4082, 4459, 4710, 5145, 5495, 6123, 6370, 6594, 7693, 8918, 9555, 10205, 10290, 10990, 12246, 13377, 14287, 15386, 16485, 19110, 20410, 22295, 23079, 26754, 28574, 30615, 32970, 38465, 42861, 44590, 46158, 53851, 61230, 66885, 71435, 76930, 85722, 100009, 107702, 115395, 133770, 142870, 161553, 200018, 214305, 230790, 269255, 300027, 323106, 428610, 500045, 538510, 600054, 700063, 807765, 1000090, 1400126, 1500135, 1615530, 2100189, 3000270, 3500315, 4200378, 7000630, 10500945, 21001890]

約数ペア:

[(1, 21001890), (2, 10500945), (3, 7000630), (5, 4200378), (6, 3500315), (7, 3000270), (10, 2100189), (13, 1615530), (14, 1500135), (15, 1400126), (21, 1000090), (26, 807765), (30, 700063), (35, 600054), (39, 538510), (42, 500045), (49, 428610), (65, 323106), (70, 300027), (78, 269255), (91, 230790), (98, 214305), (105, 200018), (130, 161553), (147, 142870), (157, 133770), (182, 115395), (195, 107702), (210, 100009), (245, 85722), (273, 76930), (294, 71435), (314, 66885), (343, 61230), (390, 53851), (455, 46158), (471, 44590), (490, 42861), (546, 38465), (637, 32970), (686, 30615), (735, 28574), (785, 26754), (910, 23079), (942, 22295), (1029, 20410), (1099, 19110), (1274, 16485), (1365, 15386), (1470, 14287), (1570, 13377), (1715, 12246), (1911, 10990), (2041, 10290), (2058, 10205), (2198, 9555), (2355, 8918), (2730, 7693), (3185, 6594), (3297, 6370), (3430, 6123), (3822, 5495), (4082, 5145), (4459, 4710)]