21044980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^2\times {\mathrm{331}}^1$

素因数の和:385

約数の個数: 72

約数和(自身を含む): 51369696

約数和(自身を除く): 30324716

約数列:

[1, 2, 4, 5, 10, 11, 17, 20, 22, 34, 44, 55, 68, 85, 110, 170, 187, 220, 289, 331, 340, 374, 578, 662, 748, 935, 1156, 1324, 1445, 1655, 1870, 2890, 3179, 3310, 3641, 3740, 5627, 5780, 6358, 6620, 7282, 11254, 12716, 14564, 15895, 18205, 22508, 28135, 31790, 36410, 56270, 61897, 63580, 72820, 95659, 112540, 123794, 191318, 247588, 309485, 382636, 478295, 618970, 956590, 1052249, 1237940, 1913180, 2104498, 4208996, 5261245, 10522490, 21044980]

約数ペア:

[(1, 21044980), (2, 10522490), (4, 5261245), (5, 4208996), (10, 2104498), (11, 1913180), (17, 1237940), (20, 1052249), (22, 956590), (34, 618970), (44, 478295), (55, 382636), (68, 309485), (85, 247588), (110, 191318), (170, 123794), (187, 112540), (220, 95659), (289, 72820), (331, 63580), (340, 61897), (374, 56270), (578, 36410), (662, 31790), (748, 28135), (935, 22508), (1156, 18205), (1324, 15895), (1445, 14564), (1655, 12716), (1870, 11254), (2890, 7282), (3179, 6620), (3310, 6358), (3641, 5780), (3740, 5627)]