21227560

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{53}}^1$

素因数の和:131

約数の個数: 128

約数和(自身を含む): 55987200

約数和(自身を除く): 34759640

約数列:

[1, 2, 4, 5, 8, 10, 17, 19, 20, 31, 34, 38, 40, 53, 62, 68, 76, 85, 95, 106, 124, 136, 152, 155, 170, 190, 212, 248, 265, 310, 323, 340, 380, 424, 527, 530, 589, 620, 646, 680, 760, 901, 1007, 1054, 1060, 1178, 1240, 1292, 1615, 1643, 1802, 2014, 2108, 2120, 2356, 2584, 2635, 2945, 3230, 3286, 3604, 4028, 4216, 4505, 4712, 5035, 5270, 5890, 6460, 6572, 7208, 8056, 8215, 9010, 10013, 10070, 10540, 11780, 12920, 13144, 16430, 17119, 18020, 20026, 20140, 21080, 23560, 27931, 31217, 32860, 34238, 36040, 40052, 40280, 50065, 55862, 62434, 65720, 68476, 80104, 85595, 100130, 111724, 124868, 136952, 139655, 156085, 171190, 200260, 223448, 249736, 279310, 312170, 342380, 400520, 530689, 558620, 624340, 684760, 1061378, 1117240, 1248680, 2122756, 2653445, 4245512, 5306890, 10613780, 21227560]

約数ペア:

[(1, 21227560), (2, 10613780), (4, 5306890), (5, 4245512), (8, 2653445), (10, 2122756), (17, 1248680), (19, 1117240), (20, 1061378), (31, 684760), (34, 624340), (38, 558620), (40, 530689), (53, 400520), (62, 342380), (68, 312170), (76, 279310), (85, 249736), (95, 223448), (106, 200260), (124, 171190), (136, 156085), (152, 139655), (155, 136952), (170, 124868), (190, 111724), (212, 100130), (248, 85595), (265, 80104), (310, 68476), (323, 65720), (340, 62434), (380, 55862), (424, 50065), (527, 40280), (530, 40052), (589, 36040), (620, 34238), (646, 32860), (680, 31217), (760, 27931), (901, 23560), (1007, 21080), (1054, 20140), (1060, 20026), (1178, 18020), (1240, 17119), (1292, 16430), (1615, 13144), (1643, 12920), (1802, 11780), (2014, 10540), (2108, 10070), (2120, 10013), (2356, 9010), (2584, 8215), (2635, 8056), (2945, 7208), (3230, 6572), (3286, 6460), (3604, 5890), (4028, 5270), (4216, 5035), (4505, 4712)]