21121480

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{89}}^1\times {\mathrm{349}}^1$

素因数の和:466

約数の個数: 64

約数和(自身を含む): 51030000

約数和(自身を除く): 29908520

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 89, 136, 170, 178, 340, 349, 356, 445, 680, 698, 712, 890, 1396, 1513, 1745, 1780, 2792, 3026, 3490, 3560, 5933, 6052, 6980, 7565, 11866, 12104, 13960, 15130, 23732, 29665, 30260, 31061, 47464, 59330, 60520, 62122, 118660, 124244, 155305, 237320, 248488, 310610, 528037, 621220, 1056074, 1242440, 2112148, 2640185, 4224296, 5280370, 10560740, 21121480]

約数ペア:

[(1, 21121480), (2, 10560740), (4, 5280370), (5, 4224296), (8, 2640185), (10, 2112148), (17, 1242440), (20, 1056074), (34, 621220), (40, 528037), (68, 310610), (85, 248488), (89, 237320), (136, 155305), (170, 124244), (178, 118660), (340, 62122), (349, 60520), (356, 59330), (445, 47464), (680, 31061), (698, 30260), (712, 29665), (890, 23732), (1396, 15130), (1513, 13960), (1745, 12104), (1780, 11866), (2792, 7565), (3026, 6980), (3490, 6052), (3560, 5933)]