21800025

素因数分解:

$3^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{257}}^1$

素因数の和:315

約数の個数: 72

約数和(自身を含む): 43669080

約数和(自身を除く): 21869055

約数列:

[1, 3, 5, 9, 13, 15, 25, 29, 39, 45, 65, 75, 87, 117, 145, 195, 225, 257, 261, 325, 377, 435, 585, 725, 771, 975, 1131, 1285, 1305, 1885, 2175, 2313, 2925, 3341, 3393, 3855, 5655, 6425, 6525, 7453, 9425, 10023, 11565, 16705, 16965, 19275, 22359, 28275, 30069, 37265, 50115, 57825, 67077, 83525, 84825, 96889, 111795, 150345, 186325, 250575, 290667, 335385, 484445, 558975, 751725, 872001, 1453335, 1676925, 2422225, 4360005, 7266675, 21800025]

約数ペア:

[(1, 21800025), (3, 7266675), (5, 4360005), (9, 2422225), (13, 1676925), (15, 1453335), (25, 872001), (29, 751725), (39, 558975), (45, 484445), (65, 335385), (75, 290667), (87, 250575), (117, 186325), (145, 150345), (195, 111795), (225, 96889), (257, 84825), (261, 83525), (325, 67077), (377, 57825), (435, 50115), (585, 37265), (725, 30069), (771, 28275), (975, 22359), (1131, 19275), (1285, 16965), (1305, 16705), (1885, 11565), (2175, 10023), (2313, 9425), (2925, 7453), (3341, 6525), (3393, 6425), (3855, 5655)]