21508760

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{311}}^1$

素因数の和:361

約数の個数: 128

約数和(自身を含む): 62899200

約数和(自身を除く): 41390440

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 19, 20, 26, 28, 35, 38, 40, 52, 56, 65, 70, 76, 91, 95, 104, 130, 133, 140, 152, 182, 190, 247, 260, 266, 280, 311, 364, 380, 455, 494, 520, 532, 622, 665, 728, 760, 910, 988, 1064, 1235, 1244, 1330, 1555, 1729, 1820, 1976, 2177, 2470, 2488, 2660, 3110, 3458, 3640, 4043, 4354, 4940, 5320, 5909, 6220, 6916, 8086, 8645, 8708, 9880, 10885, 11818, 12440, 13832, 16172, 17290, 17416, 20215, 21770, 23636, 28301, 29545, 32344, 34580, 40430, 41363, 43540, 47272, 56602, 59090, 69160, 76817, 80860, 82726, 87080, 113204, 118180, 141505, 153634, 161720, 165452, 206815, 226408, 236360, 283010, 307268, 330904, 384085, 413630, 537719, 566020, 614536, 768170, 827260, 1075438, 1132040, 1536340, 1654520, 2150876, 2688595, 3072680, 4301752, 5377190, 10754380, 21508760]

約数ペア:

[(1, 21508760), (2, 10754380), (4, 5377190), (5, 4301752), (7, 3072680), (8, 2688595), (10, 2150876), (13, 1654520), (14, 1536340), (19, 1132040), (20, 1075438), (26, 827260), (28, 768170), (35, 614536), (38, 566020), (40, 537719), (52, 413630), (56, 384085), (65, 330904), (70, 307268), (76, 283010), (91, 236360), (95, 226408), (104, 206815), (130, 165452), (133, 161720), (140, 153634), (152, 141505), (182, 118180), (190, 113204), (247, 87080), (260, 82726), (266, 80860), (280, 76817), (311, 69160), (364, 59090), (380, 56602), (455, 47272), (494, 43540), (520, 41363), (532, 40430), (622, 34580), (665, 32344), (728, 29545), (760, 28301), (910, 23636), (988, 21770), (1064, 20215), (1235, 17416), (1244, 17290), (1330, 16172), (1555, 13832), (1729, 12440), (1820, 11818), (1976, 10885), (2177, 9880), (2470, 8708), (2488, 8645), (2660, 8086), (3110, 6916), (3458, 6220), (3640, 5909), (4043, 5320), (4354, 4940)]