21281680

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{61}}^1\times {\mathrm{89}}^1$

素因数の和:177

約数の個数: 120

約数和(自身を含む): 59159160

約数和(自身を除く): 37877480

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 61, 70, 80, 89, 98, 112, 122, 140, 178, 196, 244, 245, 280, 305, 356, 392, 427, 445, 488, 490, 560, 610, 623, 712, 784, 854, 890, 976, 980, 1220, 1246, 1424, 1708, 1780, 1960, 2135, 2440, 2492, 2989, 3115, 3416, 3560, 3920, 4270, 4361, 4880, 4984, 5429, 5978, 6230, 6832, 7120, 8540, 8722, 9968, 10858, 11956, 12460, 14945, 17080, 17444, 21716, 21805, 23912, 24920, 27145, 29890, 34160, 34888, 38003, 43432, 43610, 47824, 49840, 54290, 59780, 69776, 76006, 86864, 87220, 108580, 119560, 152012, 174440, 190015, 217160, 239120, 266021, 304024, 348880, 380030, 434320, 532042, 608048, 760060, 1064084, 1330105, 1520120, 2128168, 2660210, 3040240, 4256336, 5320420, 10640840, 21281680]

約数ペア:

[(1, 21281680), (2, 10640840), (4, 5320420), (5, 4256336), (7, 3040240), (8, 2660210), (10, 2128168), (14, 1520120), (16, 1330105), (20, 1064084), (28, 760060), (35, 608048), (40, 532042), (49, 434320), (56, 380030), (61, 348880), (70, 304024), (80, 266021), (89, 239120), (98, 217160), (112, 190015), (122, 174440), (140, 152012), (178, 119560), (196, 108580), (244, 87220), (245, 86864), (280, 76006), (305, 69776), (356, 59780), (392, 54290), (427, 49840), (445, 47824), (488, 43610), (490, 43432), (560, 38003), (610, 34888), (623, 34160), (712, 29890), (784, 27145), (854, 24920), (890, 23912), (976, 21805), (980, 21716), (1220, 17444), (1246, 17080), (1424, 14945), (1708, 12460), (1780, 11956), (1960, 10858), (2135, 9968), (2440, 8722), (2492, 8540), (2989, 7120), (3115, 6832), (3416, 6230), (3560, 5978), (3920, 5429), (4270, 4984), (4361, 4880)]