777777980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{43}}^1\times {\mathrm{18457}}^1$

素因数の和:18523

約数の個数: 72

約数和(自身を含む): 1944291888

約数和(自身を除く): 1166513908

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 43, 49, 70, 86, 98, 140, 172, 196, 215, 245, 301, 430, 490, 602, 860, 980, 1204, 1505, 2107, 3010, 4214, 6020, 8428, 10535, 18457, 21070, 36914, 42140, 73828, 92285, 129199, 184570, 258398, 369140, 516796, 645995, 793651, 904393, 1291990, 1587302, 1808786, 2583980, 3174604, 3617572, 3968255, 4521965, 5555557, 7936510, 9043930, 11111114, 15873020, 18087860, 22222228, 27777785, 38888899, 55555570, 77777798, 111111140, 155555596, 194444495, 388888990, 777777980]

約数ペア:

[(1, 777777980), (2, 388888990), (4, 194444495), (5, 155555596), (7, 111111140), (10, 77777798), (14, 55555570), (20, 38888899), (28, 27777785), (35, 22222228), (43, 18087860), (49, 15873020), (70, 11111114), (86, 9043930), (98, 7936510), (140, 5555557), (172, 4521965), (196, 3968255), (215, 3617572), (245, 3174604), (301, 2583980), (430, 1808786), (490, 1587302), (602, 1291990), (860, 904393), (980, 793651), (1204, 645995), (1505, 516796), (2107, 369140), (3010, 258398), (4214, 184570), (6020, 129199), (8428, 92285), (10535, 73828), (18457, 42140), (21070, 36914)]