81298900

素因数分解:

$2^2\times 5^2\times {\mathrm{41}}^1\times {\mathrm{79}}^1\times {\mathrm{251}}^1$

素因数の和:385

約数の個数: 72

約数和(自身を含む): 183738240

約数和(自身を除く): 102439340

約数列:

[1, 2, 4, 5, 10, 20, 25, 41, 50, 79, 82, 100, 158, 164, 205, 251, 316, 395, 410, 502, 790, 820, 1004, 1025, 1255, 1580, 1975, 2050, 2510, 3239, 3950, 4100, 5020, 6275, 6478, 7900, 10291, 12550, 12956, 16195, 19829, 20582, 25100, 32390, 39658, 41164, 51455, 64780, 79316, 80975, 99145, 102910, 161950, 198290, 205820, 257275, 323900, 396580, 495725, 514550, 812989, 991450, 1029100, 1625978, 1982900, 3251956, 4064945, 8129890, 16259780, 20324725, 40649450, 81298900]

約数ペア:

[(1, 81298900), (2, 40649450), (4, 20324725), (5, 16259780), (10, 8129890), (20, 4064945), (25, 3251956), (41, 1982900), (50, 1625978), (79, 1029100), (82, 991450), (100, 812989), (158, 514550), (164, 495725), (205, 396580), (251, 323900), (316, 257275), (395, 205820), (410, 198290), (502, 161950), (790, 102910), (820, 99145), (1004, 80975), (1025, 79316), (1255, 64780), (1580, 51455), (1975, 41164), (2050, 39658), (2510, 32390), (3239, 25100), (3950, 20582), (4100, 19829), (5020, 16195), (6275, 12956), (6478, 12550), (7900, 10291)]