80971720

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{97}}^1\times {\mathrm{509}}^1$

素因数の和:658

約数の個数: 64

約数和(自身を含む): 188924400

約数和(自身を除く): 107952680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 97, 164, 194, 205, 328, 388, 410, 485, 509, 776, 820, 970, 1018, 1640, 1940, 2036, 2545, 3880, 3977, 4072, 5090, 7954, 10180, 15908, 19885, 20360, 20869, 31816, 39770, 41738, 49373, 79540, 83476, 98746, 104345, 159080, 166952, 197492, 208690, 246865, 394984, 417380, 493730, 834760, 987460, 1974920, 2024293, 4048586, 8097172, 10121465, 16194344, 20242930, 40485860, 80971720]

約数ペア:

[(1, 80971720), (2, 40485860), (4, 20242930), (5, 16194344), (8, 10121465), (10, 8097172), (20, 4048586), (40, 2024293), (41, 1974920), (82, 987460), (97, 834760), (164, 493730), (194, 417380), (205, 394984), (328, 246865), (388, 208690), (410, 197492), (485, 166952), (509, 159080), (776, 104345), (820, 98746), (970, 83476), (1018, 79540), (1640, 49373), (1940, 41738), (2036, 39770), (2545, 31816), (3880, 20869), (3977, 20360), (4072, 19885), (5090, 15908), (7954, 10180)]