21380940

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{239}}^1$

素因数の和:332

約数の個数: 144

約数和(自身を含む): 75479040

約数和(自身を除く): 54098100

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 71, 84, 90, 105, 126, 140, 142, 180, 210, 213, 239, 252, 284, 315, 355, 420, 426, 478, 497, 630, 639, 710, 717, 852, 956, 994, 1065, 1195, 1260, 1278, 1420, 1434, 1491, 1673, 1988, 2130, 2151, 2390, 2485, 2556, 2868, 2982, 3195, 3346, 3585, 4260, 4302, 4473, 4780, 4970, 5019, 5964, 6390, 6692, 7170, 7455, 8365, 8604, 8946, 9940, 10038, 10755, 12780, 14340, 14910, 15057, 16730, 16969, 17892, 20076, 21510, 22365, 25095, 29820, 30114, 33460, 33938, 43020, 44730, 50190, 50907, 60228, 67876, 75285, 84845, 89460, 100380, 101814, 118783, 150570, 152721, 169690, 203628, 237566, 254535, 301140, 305442, 339380, 356349, 475132, 509070, 593915, 610884, 712698, 763605, 1018140, 1069047, 1187830, 1425396, 1527210, 1781745, 2138094, 2375660, 3054420, 3563490, 4276188, 5345235, 7126980, 10690470, 21380940]

約数ペア:

[(1, 21380940), (2, 10690470), (3, 7126980), (4, 5345235), (5, 4276188), (6, 3563490), (7, 3054420), (9, 2375660), (10, 2138094), (12, 1781745), (14, 1527210), (15, 1425396), (18, 1187830), (20, 1069047), (21, 1018140), (28, 763605), (30, 712698), (35, 610884), (36, 593915), (42, 509070), (45, 475132), (60, 356349), (63, 339380), (70, 305442), (71, 301140), (84, 254535), (90, 237566), (105, 203628), (126, 169690), (140, 152721), (142, 150570), (180, 118783), (210, 101814), (213, 100380), (239, 89460), (252, 84845), (284, 75285), (315, 67876), (355, 60228), (420, 50907), (426, 50190), (478, 44730), (497, 43020), (630, 33938), (639, 33460), (710, 30114), (717, 29820), (852, 25095), (956, 22365), (994, 21510), (1065, 20076), (1195, 17892), (1260, 16969), (1278, 16730), (1420, 15057), (1434, 14910), (1491, 14340), (1673, 12780), (1988, 10755), (2130, 10038), (2151, 9940), (2390, 8946), (2485, 8604), (2556, 8365), (2868, 7455), (2982, 7170), (3195, 6692), (3346, 6390), (3585, 5964), (4260, 5019), (4302, 4970), (4473, 4780)]