20421375

素因数分解:

$3^1\times 5^3\times {\mathrm{13}}^1\times {\mathrm{59}}^1\times {\mathrm{71}}^1$

素因数の和:161

約数の個数: 64

約数和(自身を含む): 37739520

約数和(自身を除く): 17318145

約数列:

[1, 3, 5, 13, 15, 25, 39, 59, 65, 71, 75, 125, 177, 195, 213, 295, 325, 355, 375, 767, 885, 923, 975, 1065, 1475, 1625, 1775, 2301, 2769, 3835, 4189, 4425, 4615, 4875, 5325, 7375, 8875, 11505, 12567, 13845, 19175, 20945, 22125, 23075, 26625, 54457, 57525, 62835, 69225, 95875, 104725, 115375, 163371, 272285, 287625, 314175, 346125, 523625, 816855, 1361425, 1570875, 4084275, 6807125, 20421375]

約数ペア:

[(1, 20421375), (3, 6807125), (5, 4084275), (13, 1570875), (15, 1361425), (25, 816855), (39, 523625), (59, 346125), (65, 314175), (71, 287625), (75, 272285), (125, 163371), (177, 115375), (195, 104725), (213, 95875), (295, 69225), (325, 62835), (355, 57525), (375, 54457), (767, 26625), (885, 23075), (923, 22125), (975, 20945), (1065, 19175), (1475, 13845), (1625, 12567), (1775, 11505), (2301, 8875), (2769, 7375), (3835, 5325), (4189, 4875), (4425, 4615)]