21155420

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^2\times {\mathrm{569}}^1$

素因数の和:615

約数の個数: 72

約数和(自身を含む): 52572240

約数和(自身を除く): 31416820

約数列:

[1, 2, 4, 5, 10, 11, 13, 20, 22, 26, 44, 52, 55, 65, 110, 130, 143, 169, 220, 260, 286, 338, 569, 572, 676, 715, 845, 1138, 1430, 1690, 1859, 2276, 2845, 2860, 3380, 3718, 5690, 6259, 7397, 7436, 9295, 11380, 12518, 14794, 18590, 25036, 29588, 31295, 36985, 37180, 62590, 73970, 81367, 96161, 125180, 147940, 162734, 192322, 325468, 384644, 406835, 480805, 813670, 961610, 1057771, 1627340, 1923220, 2115542, 4231084, 5288855, 10577710, 21155420]

約数ペア:

[(1, 21155420), (2, 10577710), (4, 5288855), (5, 4231084), (10, 2115542), (11, 1923220), (13, 1627340), (20, 1057771), (22, 961610), (26, 813670), (44, 480805), (52, 406835), (55, 384644), (65, 325468), (110, 192322), (130, 162734), (143, 147940), (169, 125180), (220, 96161), (260, 81367), (286, 73970), (338, 62590), (569, 37180), (572, 36985), (676, 31295), (715, 29588), (845, 25036), (1138, 18590), (1430, 14794), (1690, 12518), (1859, 11380), (2276, 9295), (2845, 7436), (2860, 7397), (3380, 6259), (3718, 5690)]