20731984

素因数分解:

$2^4\times 7^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{491}}^1$

素因数の和:548

約数の個数: 80

約数和(自身を含む): 51246720

約数和(自身を除く): 30514736

約数列:

[1, 2, 4, 7, 8, 13, 14, 16, 26, 28, 29, 52, 56, 58, 91, 104, 112, 116, 182, 203, 208, 232, 364, 377, 406, 464, 491, 728, 754, 812, 982, 1456, 1508, 1624, 1964, 2639, 3016, 3248, 3437, 3928, 5278, 6032, 6383, 6874, 7856, 10556, 12766, 13748, 14239, 21112, 25532, 27496, 28478, 42224, 44681, 51064, 54992, 56956, 89362, 99673, 102128, 113912, 178724, 185107, 199346, 227824, 357448, 370214, 398692, 714896, 740428, 797384, 1295749, 1480856, 1594768, 2591498, 2961712, 5182996, 10365992, 20731984]

約数ペア:

[(1, 20731984), (2, 10365992), (4, 5182996), (7, 2961712), (8, 2591498), (13, 1594768), (14, 1480856), (16, 1295749), (26, 797384), (28, 740428), (29, 714896), (52, 398692), (56, 370214), (58, 357448), (91, 227824), (104, 199346), (112, 185107), (116, 178724), (182, 113912), (203, 102128), (208, 99673), (232, 89362), (364, 56956), (377, 54992), (406, 51064), (464, 44681), (491, 42224), (728, 28478), (754, 27496), (812, 25532), (982, 21112), (1456, 14239), (1508, 13748), (1624, 12766), (1964, 10556), (2639, 7856), (3016, 6874), (3248, 6383), (3437, 6032), (3928, 5278)]