20521720

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{103}}^1\times {\mathrm{293}}^1$

素因数の和:424

約数の個数: 64

約数和(自身を含む): 49533120

約数和(自身を除く): 29011400

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 103, 136, 170, 206, 293, 340, 412, 515, 586, 680, 824, 1030, 1172, 1465, 1751, 2060, 2344, 2930, 3502, 4120, 4981, 5860, 7004, 8755, 9962, 11720, 14008, 17510, 19924, 24905, 30179, 35020, 39848, 49810, 60358, 70040, 99620, 120716, 150895, 199240, 241432, 301790, 513043, 603580, 1026086, 1207160, 2052172, 2565215, 4104344, 5130430, 10260860, 20521720]

約数ペア:

[(1, 20521720), (2, 10260860), (4, 5130430), (5, 4104344), (8, 2565215), (10, 2052172), (17, 1207160), (20, 1026086), (34, 603580), (40, 513043), (68, 301790), (85, 241432), (103, 199240), (136, 150895), (170, 120716), (206, 99620), (293, 70040), (340, 60358), (412, 49810), (515, 39848), (586, 35020), (680, 30179), (824, 24905), (1030, 19924), (1172, 17510), (1465, 14008), (1751, 11720), (2060, 9962), (2344, 8755), (2930, 7004), (3502, 5860), (4120, 4981)]