20407880

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{73}}^1\times {\mathrm{241}}^1$

素因数の和:354

約数の個数: 64

約数和(自身を含む): 48351600

約数和(自身を除く): 27943720

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 58, 73, 116, 145, 146, 232, 241, 290, 292, 365, 482, 580, 584, 730, 964, 1160, 1205, 1460, 1928, 2117, 2410, 2920, 4234, 4820, 6989, 8468, 9640, 10585, 13978, 16936, 17593, 21170, 27956, 34945, 35186, 42340, 55912, 69890, 70372, 84680, 87965, 139780, 140744, 175930, 279560, 351860, 510197, 703720, 1020394, 2040788, 2550985, 4081576, 5101970, 10203940, 20407880]

約数ペア:

[(1, 20407880), (2, 10203940), (4, 5101970), (5, 4081576), (8, 2550985), (10, 2040788), (20, 1020394), (29, 703720), (40, 510197), (58, 351860), (73, 279560), (116, 175930), (145, 140744), (146, 139780), (232, 87965), (241, 84680), (290, 70372), (292, 69890), (365, 55912), (482, 42340), (580, 35186), (584, 34945), (730, 27956), (964, 21170), (1160, 17593), (1205, 16936), (1460, 13978), (1928, 10585), (2117, 9640), (2410, 8468), (2920, 6989), (4234, 4820)]