21267440

素因数分解:

$2^4\times 5^1\times {\mathrm{29}}^1\times {\mathrm{89}}^1\times {\mathrm{103}}^1$

素因数の和:234

約数の個数: 80

約数和(自身を含む): 52228800

約数和(自身を除く): 30961360

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 29, 40, 58, 80, 89, 103, 116, 145, 178, 206, 232, 290, 356, 412, 445, 464, 515, 580, 712, 824, 890, 1030, 1160, 1424, 1648, 1780, 2060, 2320, 2581, 2987, 3560, 4120, 5162, 5974, 7120, 8240, 9167, 10324, 11948, 12905, 14935, 18334, 20648, 23896, 25810, 29870, 36668, 41296, 45835, 47792, 51620, 59740, 73336, 91670, 103240, 119480, 146672, 183340, 206480, 238960, 265843, 366680, 531686, 733360, 1063372, 1329215, 2126744, 2658430, 4253488, 5316860, 10633720, 21267440]

約数ペア:

[(1, 21267440), (2, 10633720), (4, 5316860), (5, 4253488), (8, 2658430), (10, 2126744), (16, 1329215), (20, 1063372), (29, 733360), (40, 531686), (58, 366680), (80, 265843), (89, 238960), (103, 206480), (116, 183340), (145, 146672), (178, 119480), (206, 103240), (232, 91670), (290, 73336), (356, 59740), (412, 51620), (445, 47792), (464, 45835), (515, 41296), (580, 36668), (712, 29870), (824, 25810), (890, 23896), (1030, 20648), (1160, 18334), (1424, 14935), (1648, 12905), (1780, 11948), (2060, 10324), (2320, 9167), (2581, 8240), (2987, 7120), (3560, 5974), (4120, 5162)]