20646255

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{79}}^1\times {\mathrm{131}}^1$

素因数の和:244

約数の個数: 64

約数和(自身を含む): 40550400

約数和(自身を除く): 19904145

約数列:

[1, 3, 5, 7, 15, 19, 21, 35, 57, 79, 95, 105, 131, 133, 237, 285, 393, 395, 399, 553, 655, 665, 917, 1185, 1501, 1659, 1965, 1995, 2489, 2751, 2765, 4503, 4585, 7467, 7505, 8295, 10349, 10507, 12445, 13755, 17423, 22515, 31047, 31521, 37335, 51745, 52269, 52535, 72443, 87115, 155235, 157605, 196631, 217329, 261345, 362215, 589893, 983155, 1086645, 1376417, 2949465, 4129251, 6882085, 20646255]

約数ペア:

[(1, 20646255), (3, 6882085), (5, 4129251), (7, 2949465), (15, 1376417), (19, 1086645), (21, 983155), (35, 589893), (57, 362215), (79, 261345), (95, 217329), (105, 196631), (131, 157605), (133, 155235), (237, 87115), (285, 72443), (393, 52535), (395, 52269), (399, 51745), (553, 37335), (655, 31521), (665, 31047), (917, 22515), (1185, 17423), (1501, 13755), (1659, 12445), (1965, 10507), (1995, 10349), (2489, 8295), (2751, 7505), (2765, 7467), (4503, 4585)]