21156880

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{449}}^1$

素因数の和:512

約数の個数: 80

約数和(自身を含む): 53568000

約数和(自身を除く): 32411120

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 31, 38, 40, 62, 76, 80, 95, 124, 152, 155, 190, 248, 304, 310, 380, 449, 496, 589, 620, 760, 898, 1178, 1240, 1520, 1796, 2245, 2356, 2480, 2945, 3592, 4490, 4712, 5890, 7184, 8531, 8980, 9424, 11780, 13919, 17062, 17960, 23560, 27838, 34124, 35920, 42655, 47120, 55676, 68248, 69595, 85310, 111352, 136496, 139190, 170620, 222704, 264461, 278380, 341240, 528922, 556760, 682480, 1057844, 1113520, 1322305, 2115688, 2644610, 4231376, 5289220, 10578440, 21156880]

約数ペア:

[(1, 21156880), (2, 10578440), (4, 5289220), (5, 4231376), (8, 2644610), (10, 2115688), (16, 1322305), (19, 1113520), (20, 1057844), (31, 682480), (38, 556760), (40, 528922), (62, 341240), (76, 278380), (80, 264461), (95, 222704), (124, 170620), (152, 139190), (155, 136496), (190, 111352), (248, 85310), (304, 69595), (310, 68248), (380, 55676), (449, 47120), (496, 42655), (589, 35920), (620, 34124), (760, 27838), (898, 23560), (1178, 17960), (1240, 17062), (1520, 13919), (1796, 11780), (2245, 9424), (2356, 8980), (2480, 8531), (2945, 7184), (3592, 5890), (4490, 4712)]