20961465

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{19}}^2\times {\mathrm{79}}^1$

素因数の和:139

約数の個数: 72

約数和(自身を含む): 41696640

約数和(自身を除く): 20735175

約数列:

[1, 3, 5, 7, 15, 19, 21, 35, 49, 57, 79, 95, 105, 133, 147, 237, 245, 285, 361, 395, 399, 553, 665, 735, 931, 1083, 1185, 1501, 1659, 1805, 1995, 2527, 2765, 2793, 3871, 4503, 4655, 5415, 7505, 7581, 8295, 10507, 11613, 12635, 13965, 17689, 19355, 22515, 28519, 31521, 37905, 52535, 53067, 58065, 73549, 85557, 88445, 142595, 157605, 199633, 220647, 265335, 367745, 427785, 598899, 998165, 1103235, 1397431, 2994495, 4192293, 6987155, 20961465]

約数ペア:

[(1, 20961465), (3, 6987155), (5, 4192293), (7, 2994495), (15, 1397431), (19, 1103235), (21, 998165), (35, 598899), (49, 427785), (57, 367745), (79, 265335), (95, 220647), (105, 199633), (133, 157605), (147, 142595), (237, 88445), (245, 85557), (285, 73549), (361, 58065), (395, 53067), (399, 52535), (553, 37905), (665, 31521), (735, 28519), (931, 22515), (1083, 19355), (1185, 17689), (1501, 13965), (1659, 12635), (1805, 11613), (1995, 10507), (2527, 8295), (2765, 7581), (2793, 7505), (3871, 5415), (4503, 4655)]