20813240

素因数分解:

$2^3\times 5^1\times 7^3\times {\mathrm{37}}^1\times {\mathrm{41}}^1$

素因数の和:110

約数の個数: 128

約数和(自身を含む): 57456000

約数和(自身を除く): 36642760

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 37, 40, 41, 49, 56, 70, 74, 82, 98, 140, 148, 164, 185, 196, 205, 245, 259, 280, 287, 296, 328, 343, 370, 392, 410, 490, 518, 574, 686, 740, 820, 980, 1036, 1148, 1295, 1372, 1435, 1480, 1517, 1640, 1715, 1813, 1960, 2009, 2072, 2296, 2590, 2744, 2870, 3034, 3430, 3626, 4018, 5180, 5740, 6068, 6860, 7252, 7585, 8036, 9065, 10045, 10360, 10619, 11480, 12136, 12691, 13720, 14063, 14504, 15170, 16072, 18130, 20090, 21238, 25382, 28126, 30340, 36260, 40180, 42476, 50764, 53095, 56252, 60680, 63455, 70315, 72520, 74333, 80360, 84952, 101528, 106190, 112504, 126910, 140630, 148666, 212380, 253820, 281260, 297332, 371665, 424760, 507640, 520331, 562520, 594664, 743330, 1040662, 1486660, 2081324, 2601655, 2973320, 4162648, 5203310, 10406620, 20813240]

約数ペア:

[(1, 20813240), (2, 10406620), (4, 5203310), (5, 4162648), (7, 2973320), (8, 2601655), (10, 2081324), (14, 1486660), (20, 1040662), (28, 743330), (35, 594664), (37, 562520), (40, 520331), (41, 507640), (49, 424760), (56, 371665), (70, 297332), (74, 281260), (82, 253820), (98, 212380), (140, 148666), (148, 140630), (164, 126910), (185, 112504), (196, 106190), (205, 101528), (245, 84952), (259, 80360), (280, 74333), (287, 72520), (296, 70315), (328, 63455), (343, 60680), (370, 56252), (392, 53095), (410, 50764), (490, 42476), (518, 40180), (574, 36260), (686, 30340), (740, 28126), (820, 25382), (980, 21238), (1036, 20090), (1148, 18130), (1295, 16072), (1372, 15170), (1435, 14504), (1480, 14063), (1517, 13720), (1640, 12691), (1715, 12136), (1813, 11480), (1960, 10619), (2009, 10360), (2072, 10045), (2296, 9065), (2590, 8036), (2744, 7585), (2870, 7252), (3034, 6860), (3430, 6068), (3626, 5740), (4018, 5180)]