20987775

素因数分解:

$3^3\times 5^2\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{59}}^1$

素因数の和:126

約数の個数: 96

約数和(自身を含む): 42854400

約数和(自身を除く): 21866625

約数列:

[1, 3, 5, 9, 15, 17, 25, 27, 31, 45, 51, 59, 75, 85, 93, 135, 153, 155, 177, 225, 255, 279, 295, 425, 459, 465, 527, 531, 675, 765, 775, 837, 885, 1003, 1275, 1395, 1475, 1581, 1593, 1829, 2295, 2325, 2635, 2655, 3009, 3825, 4185, 4425, 4743, 5015, 5487, 6975, 7905, 7965, 9027, 9145, 11475, 13175, 13275, 14229, 15045, 16461, 20925, 23715, 25075, 27081, 27435, 31093, 39525, 39825, 45135, 45725, 49383, 71145, 75225, 82305, 93279, 118575, 135405, 137175, 155465, 225675, 246915, 279837, 355725, 411525, 466395, 677025, 777325, 839511, 1234575, 1399185, 2331975, 4197555, 6995925, 20987775]

約数ペア:

[(1, 20987775), (3, 6995925), (5, 4197555), (9, 2331975), (15, 1399185), (17, 1234575), (25, 839511), (27, 777325), (31, 677025), (45, 466395), (51, 411525), (59, 355725), (75, 279837), (85, 246915), (93, 225675), (135, 155465), (153, 137175), (155, 135405), (177, 118575), (225, 93279), (255, 82305), (279, 75225), (295, 71145), (425, 49383), (459, 45725), (465, 45135), (527, 39825), (531, 39525), (675, 31093), (765, 27435), (775, 27081), (837, 25075), (885, 23715), (1003, 20925), (1275, 16461), (1395, 15045), (1475, 14229), (1581, 13275), (1593, 13175), (1829, 11475), (2295, 9145), (2325, 9027), (2635, 7965), (2655, 7905), (3009, 6975), (3825, 5487), (4185, 5015), (4425, 4743)]