21497840

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{2953}}^1$

素因数の和:2986

約数の個数: 80

約数和(自身を含む): 61537728

約数和(自身を除く): 40039888

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 20, 26, 28, 35, 40, 52, 56, 65, 70, 80, 91, 104, 112, 130, 140, 182, 208, 260, 280, 364, 455, 520, 560, 728, 910, 1040, 1456, 1820, 2953, 3640, 5906, 7280, 11812, 14765, 20671, 23624, 29530, 38389, 41342, 47248, 59060, 76778, 82684, 103355, 118120, 153556, 165368, 191945, 206710, 236240, 268723, 307112, 330736, 383890, 413420, 537446, 614224, 767780, 826840, 1074892, 1343615, 1535560, 1653680, 2149784, 2687230, 3071120, 4299568, 5374460, 10748920, 21497840]

約数ペア:

[(1, 21497840), (2, 10748920), (4, 5374460), (5, 4299568), (7, 3071120), (8, 2687230), (10, 2149784), (13, 1653680), (14, 1535560), (16, 1343615), (20, 1074892), (26, 826840), (28, 767780), (35, 614224), (40, 537446), (52, 413420), (56, 383890), (65, 330736), (70, 307112), (80, 268723), (91, 236240), (104, 206710), (112, 191945), (130, 165368), (140, 153556), (182, 118120), (208, 103355), (260, 82684), (280, 76778), (364, 59060), (455, 47248), (520, 41342), (560, 38389), (728, 29530), (910, 23624), (1040, 20671), (1456, 14765), (1820, 11812), (2953, 7280), (3640, 5906)]