19978880

素因数分解:

$2^7\times 5^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{53}}^1$

素因数の和:122

約数の個数: 128

約数和(自身を含む): 52876800

約数和(自身を除く): 32897920

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 31, 32, 38, 40, 53, 62, 64, 76, 80, 95, 106, 124, 128, 152, 155, 160, 190, 212, 248, 265, 304, 310, 320, 380, 424, 496, 530, 589, 608, 620, 640, 760, 848, 992, 1007, 1060, 1178, 1216, 1240, 1520, 1643, 1696, 1984, 2014, 2120, 2356, 2432, 2480, 2945, 3040, 3286, 3392, 3968, 4028, 4240, 4712, 4960, 5035, 5890, 6080, 6572, 6784, 8056, 8215, 8480, 9424, 9920, 10070, 11780, 12160, 13144, 16112, 16430, 16960, 18848, 19840, 20140, 23560, 26288, 31217, 32224, 32860, 33920, 37696, 40280, 47120, 52576, 62434, 64448, 65720, 75392, 80560, 94240, 105152, 124868, 128896, 131440, 156085, 161120, 188480, 210304, 249736, 262880, 312170, 322240, 376960, 499472, 525760, 624340, 644480, 998944, 1051520, 1248680, 1997888, 2497360, 3995776, 4994720, 9989440, 19978880]

約数ペア:

[(1, 19978880), (2, 9989440), (4, 4994720), (5, 3995776), (8, 2497360), (10, 1997888), (16, 1248680), (19, 1051520), (20, 998944), (31, 644480), (32, 624340), (38, 525760), (40, 499472), (53, 376960), (62, 322240), (64, 312170), (76, 262880), (80, 249736), (95, 210304), (106, 188480), (124, 161120), (128, 156085), (152, 131440), (155, 128896), (160, 124868), (190, 105152), (212, 94240), (248, 80560), (265, 75392), (304, 65720), (310, 64448), (320, 62434), (380, 52576), (424, 47120), (496, 40280), (530, 37696), (589, 33920), (608, 32860), (620, 32224), (640, 31217), (760, 26288), (848, 23560), (992, 20140), (1007, 19840), (1060, 18848), (1178, 16960), (1216, 16430), (1240, 16112), (1520, 13144), (1643, 12160), (1696, 11780), (1984, 10070), (2014, 9920), (2120, 9424), (2356, 8480), (2432, 8215), (2480, 8056), (2945, 6784), (3040, 6572), (3286, 6080), (3392, 5890), (3968, 5035), (4028, 4960), (4240, 4712)]