21255975

素因数分解:

$3^2\times 5^2\times {\mathrm{13}}^3\times {\mathrm{43}}^1$

素因数の和:98

約数の個数: 72

約数和(自身を含む): 42202160

約数和(自身を除く): 20946185

約数列:

[1, 3, 5, 9, 13, 15, 25, 39, 43, 45, 65, 75, 117, 129, 169, 195, 215, 225, 325, 387, 507, 559, 585, 645, 845, 975, 1075, 1521, 1677, 1935, 2197, 2535, 2795, 2925, 3225, 4225, 5031, 6591, 7267, 7605, 8385, 9675, 10985, 12675, 13975, 19773, 21801, 25155, 32955, 36335, 38025, 41925, 54925, 65403, 94471, 98865, 109005, 125775, 164775, 181675, 283413, 327015, 472355, 494325, 545025, 850239, 1417065, 1635075, 2361775, 4251195, 7085325, 21255975]

約数ペア:

[(1, 21255975), (3, 7085325), (5, 4251195), (9, 2361775), (13, 1635075), (15, 1417065), (25, 850239), (39, 545025), (43, 494325), (45, 472355), (65, 327015), (75, 283413), (117, 181675), (129, 164775), (169, 125775), (195, 109005), (215, 98865), (225, 94471), (325, 65403), (387, 54925), (507, 41925), (559, 38025), (585, 36335), (645, 32955), (845, 25155), (975, 21801), (1075, 19773), (1521, 13975), (1677, 12675), (1935, 10985), (2197, 9675), (2535, 8385), (2795, 7605), (2925, 7267), (3225, 6591), (4225, 5031)]