20491120

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1$

素因数の和:123

約数の個数: 160

約数和(自身を含む): 58121280

約数和(自身を除く): 37630160

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 17, 19, 20, 26, 34, 38, 40, 52, 61, 65, 68, 76, 80, 85, 95, 104, 122, 130, 136, 152, 170, 190, 208, 221, 244, 247, 260, 272, 304, 305, 323, 340, 380, 442, 488, 494, 520, 610, 646, 680, 760, 793, 884, 976, 988, 1037, 1040, 1105, 1159, 1220, 1235, 1292, 1360, 1520, 1586, 1615, 1768, 1976, 2074, 2210, 2318, 2440, 2470, 2584, 3172, 3230, 3536, 3952, 3965, 4148, 4199, 4420, 4636, 4880, 4940, 5168, 5185, 5795, 6344, 6460, 7930, 8296, 8398, 8840, 9272, 9880, 10370, 11590, 12688, 12920, 13481, 15067, 15860, 16592, 16796, 17680, 18544, 19703, 19760, 20740, 20995, 23180, 25840, 26962, 30134, 31720, 33592, 39406, 41480, 41990, 46360, 53924, 60268, 63440, 67184, 67405, 75335, 78812, 82960, 83980, 92720, 98515, 107848, 120536, 134810, 150670, 157624, 167960, 197030, 215696, 241072, 256139, 269620, 301340, 315248, 335920, 394060, 512278, 539240, 602680, 788120, 1024556, 1078480, 1205360, 1280695, 1576240, 2049112, 2561390, 4098224, 5122780, 10245560, 20491120]

約数ペア:

[(1, 20491120), (2, 10245560), (4, 5122780), (5, 4098224), (8, 2561390), (10, 2049112), (13, 1576240), (16, 1280695), (17, 1205360), (19, 1078480), (20, 1024556), (26, 788120), (34, 602680), (38, 539240), (40, 512278), (52, 394060), (61, 335920), (65, 315248), (68, 301340), (76, 269620), (80, 256139), (85, 241072), (95, 215696), (104, 197030), (122, 167960), (130, 157624), (136, 150670), (152, 134810), (170, 120536), (190, 107848), (208, 98515), (221, 92720), (244, 83980), (247, 82960), (260, 78812), (272, 75335), (304, 67405), (305, 67184), (323, 63440), (340, 60268), (380, 53924), (442, 46360), (488, 41990), (494, 41480), (520, 39406), (610, 33592), (646, 31720), (680, 30134), (760, 26962), (793, 25840), (884, 23180), (976, 20995), (988, 20740), (1037, 19760), (1040, 19703), (1105, 18544), (1159, 17680), (1220, 16796), (1235, 16592), (1292, 15860), (1360, 15067), (1520, 13481), (1586, 12920), (1615, 12688), (1768, 11590), (1976, 10370), (2074, 9880), (2210, 9272), (2318, 8840), (2440, 8398), (2470, 8296), (2584, 7930), (3172, 6460), (3230, 6344), (3536, 5795), (3952, 5185), (3965, 5168), (4148, 4940), (4199, 4880), (4420, 4636)]