20780240

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^2\times {\mathrm{29}}^1\times {\mathrm{53}}^1$

素因数の和:121

約数の個数: 120

約数和(自身を含む): 55141560

約数和(自身を除く): 34361320

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 29, 40, 52, 53, 58, 65, 80, 104, 106, 116, 130, 145, 169, 208, 212, 232, 260, 265, 290, 338, 377, 424, 464, 520, 530, 580, 676, 689, 754, 845, 848, 1040, 1060, 1160, 1352, 1378, 1508, 1537, 1690, 1885, 2120, 2320, 2704, 2756, 3016, 3074, 3380, 3445, 3770, 4240, 4901, 5512, 6032, 6148, 6760, 6890, 7540, 7685, 8957, 9802, 11024, 12296, 13520, 13780, 15080, 15370, 17914, 19604, 19981, 24505, 24592, 27560, 30160, 30740, 35828, 39208, 39962, 44785, 49010, 55120, 61480, 71656, 78416, 79924, 89570, 98020, 99905, 122960, 143312, 159848, 179140, 196040, 199810, 259753, 319696, 358280, 392080, 399620, 519506, 716560, 799240, 1039012, 1298765, 1598480, 2078024, 2597530, 4156048, 5195060, 10390120, 20780240]

約数ペア:

[(1, 20780240), (2, 10390120), (4, 5195060), (5, 4156048), (8, 2597530), (10, 2078024), (13, 1598480), (16, 1298765), (20, 1039012), (26, 799240), (29, 716560), (40, 519506), (52, 399620), (53, 392080), (58, 358280), (65, 319696), (80, 259753), (104, 199810), (106, 196040), (116, 179140), (130, 159848), (145, 143312), (169, 122960), (208, 99905), (212, 98020), (232, 89570), (260, 79924), (265, 78416), (290, 71656), (338, 61480), (377, 55120), (424, 49010), (464, 44785), (520, 39962), (530, 39208), (580, 35828), (676, 30740), (689, 30160), (754, 27560), (845, 24592), (848, 24505), (1040, 19981), (1060, 19604), (1160, 17914), (1352, 15370), (1378, 15080), (1508, 13780), (1537, 13520), (1690, 12296), (1885, 11024), (2120, 9802), (2320, 8957), (2704, 7685), (2756, 7540), (3016, 6890), (3074, 6760), (3380, 6148), (3445, 6032), (3770, 5512), (4240, 4901)]