20849920

素因数分解:

$2^8\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{179}}^1$

素因数の和:220

約数の個数: 144

約数和(自身を含む): 61810560

約数和(自身を除く): 40960640

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 20, 26, 28, 32, 35, 40, 52, 56, 64, 65, 70, 80, 91, 104, 112, 128, 130, 140, 160, 179, 182, 208, 224, 256, 260, 280, 320, 358, 364, 416, 448, 455, 520, 560, 640, 716, 728, 832, 895, 896, 910, 1040, 1120, 1253, 1280, 1432, 1456, 1664, 1790, 1792, 1820, 2080, 2240, 2327, 2506, 2864, 2912, 3328, 3580, 3640, 4160, 4480, 4654, 5012, 5728, 5824, 6265, 7160, 7280, 8320, 8960, 9308, 10024, 11456, 11635, 11648, 12530, 14320, 14560, 16289, 16640, 18616, 20048, 22912, 23270, 23296, 25060, 28640, 29120, 32578, 37232, 40096, 45824, 46540, 50120, 57280, 58240, 65156, 74464, 80192, 81445, 93080, 100240, 114560, 116480, 130312, 148928, 160384, 162890, 186160, 200480, 229120, 260624, 297856, 320768, 325780, 372320, 400960, 521248, 595712, 651560, 744640, 801920, 1042496, 1303120, 1489280, 1603840, 2084992, 2606240, 2978560, 4169984, 5212480, 10424960, 20849920]

約数ペア:

[(1, 20849920), (2, 10424960), (4, 5212480), (5, 4169984), (7, 2978560), (8, 2606240), (10, 2084992), (13, 1603840), (14, 1489280), (16, 1303120), (20, 1042496), (26, 801920), (28, 744640), (32, 651560), (35, 595712), (40, 521248), (52, 400960), (56, 372320), (64, 325780), (65, 320768), (70, 297856), (80, 260624), (91, 229120), (104, 200480), (112, 186160), (128, 162890), (130, 160384), (140, 148928), (160, 130312), (179, 116480), (182, 114560), (208, 100240), (224, 93080), (256, 81445), (260, 80192), (280, 74464), (320, 65156), (358, 58240), (364, 57280), (416, 50120), (448, 46540), (455, 45824), (520, 40096), (560, 37232), (640, 32578), (716, 29120), (728, 28640), (832, 25060), (895, 23296), (896, 23270), (910, 22912), (1040, 20048), (1120, 18616), (1253, 16640), (1280, 16289), (1432, 14560), (1456, 14320), (1664, 12530), (1790, 11648), (1792, 11635), (1820, 11456), (2080, 10024), (2240, 9308), (2327, 8960), (2506, 8320), (2864, 7280), (2912, 7160), (3328, 6265), (3580, 5824), (3640, 5728), (4160, 5012), (4480, 4654)]