21000420

素因数分解:

$2^2\times 3^2\times 5^1\times 7^2\times {\mathrm{2381}}^1$

素因数の和:2410

約数の個数: 108

約数和(自身を含む): 74132604

約数和(自身を除く): 53132184

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 49, 60, 63, 70, 84, 90, 98, 105, 126, 140, 147, 180, 196, 210, 245, 252, 294, 315, 420, 441, 490, 588, 630, 735, 882, 980, 1260, 1470, 1764, 2205, 2381, 2940, 4410, 4762, 7143, 8820, 9524, 11905, 14286, 16667, 21429, 23810, 28572, 33334, 35715, 42858, 47620, 50001, 66668, 71430, 83335, 85716, 100002, 107145, 116669, 142860, 150003, 166670, 200004, 214290, 233338, 250005, 300006, 333340, 350007, 428580, 466676, 500010, 583345, 600012, 700014, 750015, 1000020, 1050021, 1166690, 1400028, 1500030, 1750035, 2100042, 2333380, 3000060, 3500070, 4200084, 5250105, 7000140, 10500210, 21000420]

約数ペア:

[(1, 21000420), (2, 10500210), (3, 7000140), (4, 5250105), (5, 4200084), (6, 3500070), (7, 3000060), (9, 2333380), (10, 2100042), (12, 1750035), (14, 1500030), (15, 1400028), (18, 1166690), (20, 1050021), (21, 1000020), (28, 750015), (30, 700014), (35, 600012), (36, 583345), (42, 500010), (45, 466676), (49, 428580), (60, 350007), (63, 333340), (70, 300006), (84, 250005), (90, 233338), (98, 214290), (105, 200004), (126, 166670), (140, 150003), (147, 142860), (180, 116669), (196, 107145), (210, 100002), (245, 85716), (252, 83335), (294, 71430), (315, 66668), (420, 50001), (441, 47620), (490, 42858), (588, 35715), (630, 33334), (735, 28572), (882, 23810), (980, 21429), (1260, 16667), (1470, 14286), (1764, 11905), (2205, 9524), (2381, 8820), (2940, 7143), (4410, 4762)]