21690640

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{389}}^1$

素因数の和:460

約数の個数: 80

約数和(自身を含む): 54840240

約数和(自身を除く): 33149600

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 41, 68, 80, 82, 85, 136, 164, 170, 205, 272, 328, 340, 389, 410, 656, 680, 697, 778, 820, 1360, 1394, 1556, 1640, 1945, 2788, 3112, 3280, 3485, 3890, 5576, 6224, 6613, 6970, 7780, 11152, 13226, 13940, 15560, 15949, 26452, 27880, 31120, 31898, 33065, 52904, 55760, 63796, 66130, 79745, 105808, 127592, 132260, 159490, 255184, 264520, 271133, 318980, 529040, 542266, 637960, 1084532, 1275920, 1355665, 2169064, 2711330, 4338128, 5422660, 10845320, 21690640]

約数ペア:

[(1, 21690640), (2, 10845320), (4, 5422660), (5, 4338128), (8, 2711330), (10, 2169064), (16, 1355665), (17, 1275920), (20, 1084532), (34, 637960), (40, 542266), (41, 529040), (68, 318980), (80, 271133), (82, 264520), (85, 255184), (136, 159490), (164, 132260), (170, 127592), (205, 105808), (272, 79745), (328, 66130), (340, 63796), (389, 55760), (410, 52904), (656, 33065), (680, 31898), (697, 31120), (778, 27880), (820, 26452), (1360, 15949), (1394, 15560), (1556, 13940), (1640, 13226), (1945, 11152), (2788, 7780), (3112, 6970), (3280, 6613), (3485, 6224), (3890, 5576)]