21681720

素因数分解:

$2^3\times 3^2\times 5^1\times {\mathrm{229}}^1\times {\mathrm{263}}^1$

素因数の和:509

約数の個数: 96

約数和(自身を含む): 71042400

約数和(自身を除く): 49360680

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 60, 72, 90, 120, 180, 229, 263, 360, 458, 526, 687, 789, 916, 1052, 1145, 1315, 1374, 1578, 1832, 2061, 2104, 2290, 2367, 2630, 2748, 3156, 3435, 3945, 4122, 4580, 4734, 5260, 5496, 6312, 6870, 7890, 8244, 9160, 9468, 10305, 10520, 11835, 13740, 15780, 16488, 18936, 20610, 23670, 27480, 31560, 41220, 47340, 60227, 82440, 94680, 120454, 180681, 240908, 301135, 361362, 481816, 542043, 602270, 722724, 903405, 1084086, 1204540, 1445448, 1806810, 2168172, 2409080, 2710215, 3613620, 4336344, 5420430, 7227240, 10840860, 21681720]

約数ペア:

[(1, 21681720), (2, 10840860), (3, 7227240), (4, 5420430), (5, 4336344), (6, 3613620), (8, 2710215), (9, 2409080), (10, 2168172), (12, 1806810), (15, 1445448), (18, 1204540), (20, 1084086), (24, 903405), (30, 722724), (36, 602270), (40, 542043), (45, 481816), (60, 361362), (72, 301135), (90, 240908), (120, 180681), (180, 120454), (229, 94680), (263, 82440), (360, 60227), (458, 47340), (526, 41220), (687, 31560), (789, 27480), (916, 23670), (1052, 20610), (1145, 18936), (1315, 16488), (1374, 15780), (1578, 13740), (1832, 11835), (2061, 10520), (2104, 10305), (2290, 9468), (2367, 9160), (2630, 8244), (2748, 7890), (3156, 6870), (3435, 6312), (3945, 5496), (4122, 5260), (4580, 4734)]