20538840

素因数分解:

$2^3\times 3^1\times 5^1\times 7^3\times {\mathrm{499}}^1$

素因数の和:534

約数の個数: 128

約数和(自身を含む): 72000000

約数和(自身を除く): 51461160

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 49, 56, 60, 70, 84, 98, 105, 120, 140, 147, 168, 196, 210, 245, 280, 294, 343, 392, 420, 490, 499, 588, 686, 735, 840, 980, 998, 1029, 1176, 1372, 1470, 1497, 1715, 1960, 1996, 2058, 2495, 2744, 2940, 2994, 3430, 3493, 3992, 4116, 4990, 5145, 5880, 5988, 6860, 6986, 7485, 8232, 9980, 10290, 10479, 11976, 13720, 13972, 14970, 17465, 19960, 20580, 20958, 24451, 27944, 29940, 34930, 41160, 41916, 48902, 52395, 59880, 69860, 73353, 83832, 97804, 104790, 122255, 139720, 146706, 171157, 195608, 209580, 244510, 293412, 342314, 366765, 419160, 489020, 513471, 586824, 684628, 733530, 855785, 978040, 1026942, 1369256, 1467060, 1711570, 2053884, 2567355, 2934120, 3423140, 4107768, 5134710, 6846280, 10269420, 20538840]

約数ペア:

[(1, 20538840), (2, 10269420), (3, 6846280), (4, 5134710), (5, 4107768), (6, 3423140), (7, 2934120), (8, 2567355), (10, 2053884), (12, 1711570), (14, 1467060), (15, 1369256), (20, 1026942), (21, 978040), (24, 855785), (28, 733530), (30, 684628), (35, 586824), (40, 513471), (42, 489020), (49, 419160), (56, 366765), (60, 342314), (70, 293412), (84, 244510), (98, 209580), (105, 195608), (120, 171157), (140, 146706), (147, 139720), (168, 122255), (196, 104790), (210, 97804), (245, 83832), (280, 73353), (294, 69860), (343, 59880), (392, 52395), (420, 48902), (490, 41916), (499, 41160), (588, 34930), (686, 29940), (735, 27944), (840, 24451), (980, 20958), (998, 20580), (1029, 19960), (1176, 17465), (1372, 14970), (1470, 13972), (1497, 13720), (1715, 11976), (1960, 10479), (1996, 10290), (2058, 9980), (2495, 8232), (2744, 7485), (2940, 6986), (2994, 6860), (3430, 5988), (3493, 5880), (3992, 5145), (4116, 4990)]