81337360

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{197}}^1\times {\mathrm{397}}^1$

素因数の和:620

約数の個数: 80

約数和(自身を含む): 205205616

約数和(自身を除く): 123868256

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 197, 208, 260, 394, 397, 520, 788, 794, 985, 1040, 1576, 1588, 1970, 1985, 2561, 3152, 3176, 3940, 3970, 5122, 5161, 6352, 7880, 7940, 10244, 10322, 12805, 15760, 15880, 20488, 20644, 25610, 25805, 31760, 40976, 41288, 51220, 51610, 78209, 82576, 102440, 103220, 156418, 204880, 206440, 312836, 391045, 412880, 625672, 782090, 1016717, 1251344, 1564180, 2033434, 3128360, 4066868, 5083585, 6256720, 8133736, 10167170, 16267472, 20334340, 40668680, 81337360]

約数ペア:

[(1, 81337360), (2, 40668680), (4, 20334340), (5, 16267472), (8, 10167170), (10, 8133736), (13, 6256720), (16, 5083585), (20, 4066868), (26, 3128360), (40, 2033434), (52, 1564180), (65, 1251344), (80, 1016717), (104, 782090), (130, 625672), (197, 412880), (208, 391045), (260, 312836), (394, 206440), (397, 204880), (520, 156418), (788, 103220), (794, 102440), (985, 82576), (1040, 78209), (1576, 51610), (1588, 51220), (1970, 41288), (1985, 40976), (2561, 31760), (3152, 25805), (3176, 25610), (3940, 20644), (3970, 20488), (5122, 15880), (5161, 15760), (6352, 12805), (7880, 10322), (7940, 10244)]