81021720

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{167}}^1\times {\mathrm{311}}^1$

素因数の和:505

約数の個数: 128

約数和(自身を含む): 264176640

約数和(自身を除く): 183154920

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 20, 24, 26, 30, 39, 40, 52, 60, 65, 78, 104, 120, 130, 156, 167, 195, 260, 311, 312, 334, 390, 501, 520, 622, 668, 780, 835, 933, 1002, 1244, 1336, 1555, 1560, 1670, 1866, 2004, 2171, 2488, 2505, 3110, 3340, 3732, 4008, 4043, 4342, 4665, 5010, 6220, 6513, 6680, 7464, 8086, 8684, 9330, 10020, 10855, 12129, 12440, 13026, 16172, 17368, 18660, 20040, 20215, 21710, 24258, 26052, 32344, 32565, 37320, 40430, 43420, 48516, 51937, 52104, 60645, 65130, 80860, 86840, 97032, 103874, 121290, 130260, 155811, 161720, 207748, 242580, 259685, 260520, 311622, 415496, 485160, 519370, 623244, 675181, 779055, 1038740, 1246488, 1350362, 1558110, 2025543, 2077480, 2700724, 3116220, 3375905, 4051086, 5401448, 6232440, 6751810, 8102172, 10127715, 13503620, 16204344, 20255430, 27007240, 40510860, 81021720]

約数ペア:

[(1, 81021720), (2, 40510860), (3, 27007240), (4, 20255430), (5, 16204344), (6, 13503620), (8, 10127715), (10, 8102172), (12, 6751810), (13, 6232440), (15, 5401448), (20, 4051086), (24, 3375905), (26, 3116220), (30, 2700724), (39, 2077480), (40, 2025543), (52, 1558110), (60, 1350362), (65, 1246488), (78, 1038740), (104, 779055), (120, 675181), (130, 623244), (156, 519370), (167, 485160), (195, 415496), (260, 311622), (311, 260520), (312, 259685), (334, 242580), (390, 207748), (501, 161720), (520, 155811), (622, 130260), (668, 121290), (780, 103874), (835, 97032), (933, 86840), (1002, 80860), (1244, 65130), (1336, 60645), (1555, 52104), (1560, 51937), (1670, 48516), (1866, 43420), (2004, 40430), (2171, 37320), (2488, 32565), (2505, 32344), (3110, 26052), (3340, 24258), (3732, 21710), (4008, 20215), (4043, 20040), (4342, 18660), (4665, 17368), (5010, 16172), (6220, 13026), (6513, 12440), (6680, 12129), (7464, 10855), (8086, 10020), (8684, 9330)]