20778525

素因数分解:

$3^4\times 5^2\times {\mathrm{31}}^1\times {\mathrm{331}}^1$

素因数の和:384

約数の個数: 60

約数和(自身を含む): 39850624

約数和(自身を除く): 19072099

約数列:

[1, 3, 5, 9, 15, 25, 27, 31, 45, 75, 81, 93, 135, 155, 225, 279, 331, 405, 465, 675, 775, 837, 993, 1395, 1655, 2025, 2325, 2511, 2979, 4185, 4965, 6975, 8275, 8937, 10261, 12555, 14895, 20925, 24825, 26811, 30783, 44685, 51305, 62775, 74475, 92349, 134055, 153915, 223425, 256525, 277047, 461745, 670275, 769575, 831141, 1385235, 2308725, 4155705, 6926175, 20778525]

約数ペア:

[(1, 20778525), (3, 6926175), (5, 4155705), (9, 2308725), (15, 1385235), (25, 831141), (27, 769575), (31, 670275), (45, 461745), (75, 277047), (81, 256525), (93, 223425), (135, 153915), (155, 134055), (225, 92349), (279, 74475), (331, 62775), (405, 51305), (465, 44685), (675, 30783), (775, 26811), (837, 24825), (993, 20925), (1395, 14895), (1655, 12555), (2025, 10261), (2325, 8937), (2511, 8275), (2979, 6975), (4185, 4965)]