21238425

素因数分解:

$3^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{137}}^1$

素因数の和:219

約数の個数: 72

約数和(自身を含む): 42044184

約数和(自身を除く): 20805759

約数列:

[1, 3, 5, 9, 13, 15, 25, 39, 45, 53, 65, 75, 117, 137, 159, 195, 225, 265, 325, 411, 477, 585, 685, 689, 795, 975, 1233, 1325, 1781, 2055, 2067, 2385, 2925, 3425, 3445, 3975, 5343, 6165, 6201, 7261, 8905, 10275, 10335, 11925, 16029, 17225, 21783, 26715, 30825, 31005, 36305, 44525, 51675, 65349, 80145, 94393, 108915, 133575, 155025, 181525, 283179, 326745, 400725, 471965, 544575, 849537, 1415895, 1633725, 2359825, 4247685, 7079475, 21238425]

約数ペア:

[(1, 21238425), (3, 7079475), (5, 4247685), (9, 2359825), (13, 1633725), (15, 1415895), (25, 849537), (39, 544575), (45, 471965), (53, 400725), (65, 326745), (75, 283179), (117, 181525), (137, 155025), (159, 133575), (195, 108915), (225, 94393), (265, 80145), (325, 65349), (411, 51675), (477, 44525), (585, 36305), (685, 31005), (689, 30825), (795, 26715), (975, 21783), (1233, 17225), (1325, 16029), (1781, 11925), (2055, 10335), (2067, 10275), (2385, 8905), (2925, 7261), (3425, 6201), (3445, 6165), (3975, 5343)]