21990780

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{563}}^1$

素因数の和:616

約数の個数: 144

約数和(自身を含む): 78833664

約数和(自身を除く): 56842884

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 31, 35, 36, 42, 45, 60, 62, 63, 70, 84, 90, 93, 105, 124, 126, 140, 155, 180, 186, 210, 217, 252, 279, 310, 315, 372, 420, 434, 465, 558, 563, 620, 630, 651, 868, 930, 1085, 1116, 1126, 1260, 1302, 1395, 1689, 1860, 1953, 2170, 2252, 2604, 2790, 2815, 3255, 3378, 3906, 3941, 4340, 5067, 5580, 5630, 6510, 6756, 7812, 7882, 8445, 9765, 10134, 11260, 11823, 13020, 15764, 16890, 17453, 19530, 19705, 20268, 23646, 25335, 33780, 34906, 35469, 39060, 39410, 47292, 50670, 52359, 59115, 69812, 70938, 78820, 87265, 101340, 104718, 118230, 122171, 141876, 157077, 174530, 177345, 209436, 236460, 244342, 261795, 314154, 349060, 354690, 366513, 488684, 523590, 610855, 628308, 709380, 733026, 785385, 1047180, 1099539, 1221710, 1466052, 1570770, 1832565, 2199078, 2443420, 3141540, 3665130, 4398156, 5497695, 7330260, 10995390, 21990780]

約数ペア:

[(1, 21990780), (2, 10995390), (3, 7330260), (4, 5497695), (5, 4398156), (6, 3665130), (7, 3141540), (9, 2443420), (10, 2199078), (12, 1832565), (14, 1570770), (15, 1466052), (18, 1221710), (20, 1099539), (21, 1047180), (28, 785385), (30, 733026), (31, 709380), (35, 628308), (36, 610855), (42, 523590), (45, 488684), (60, 366513), (62, 354690), (63, 349060), (70, 314154), (84, 261795), (90, 244342), (93, 236460), (105, 209436), (124, 177345), (126, 174530), (140, 157077), (155, 141876), (180, 122171), (186, 118230), (210, 104718), (217, 101340), (252, 87265), (279, 78820), (310, 70938), (315, 69812), (372, 59115), (420, 52359), (434, 50670), (465, 47292), (558, 39410), (563, 39060), (620, 35469), (630, 34906), (651, 33780), (868, 25335), (930, 23646), (1085, 20268), (1116, 19705), (1126, 19530), (1260, 17453), (1302, 16890), (1395, 15764), (1689, 13020), (1860, 11823), (1953, 11260), (2170, 10134), (2252, 9765), (2604, 8445), (2790, 7882), (2815, 7812), (3255, 6756), (3378, 6510), (3906, 5630), (3941, 5580), (4340, 5067)]