21861405

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^2\times {\mathrm{41}}^2$

素因数の和:127

約数の個数: 54

約数和(自身を含む): 41258958

約数和(自身を除く): 19397553

約数列:

[1, 3, 5, 9, 15, 17, 41, 45, 51, 85, 123, 153, 205, 255, 289, 369, 615, 697, 765, 867, 1445, 1681, 1845, 2091, 2601, 3485, 4335, 5043, 6273, 8405, 10455, 11849, 13005, 15129, 25215, 28577, 31365, 35547, 59245, 75645, 85731, 106641, 142885, 177735, 257193, 428655, 485809, 533205, 1285965, 1457427, 2429045, 4372281, 7287135, 21861405]

約数ペア:

[(1, 21861405), (3, 7287135), (5, 4372281), (9, 2429045), (15, 1457427), (17, 1285965), (41, 533205), (45, 485809), (51, 428655), (85, 257193), (123, 177735), (153, 142885), (205, 106641), (255, 85731), (289, 75645), (369, 59245), (615, 35547), (697, 31365), (765, 28577), (867, 25215), (1445, 15129), (1681, 13005), (1845, 11849), (2091, 10455), (2601, 8405), (3485, 6273), (4335, 5043)]