21390040

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{79}}^1\times {\mathrm{967}}^1$

素因数の和:1064

約数の個数: 64

約数和(自身を含む): 55756800

約数和(自身を除く): 34366760

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 79, 140, 158, 280, 316, 395, 553, 632, 790, 967, 1106, 1580, 1934, 2212, 2765, 3160, 3868, 4424, 4835, 5530, 6769, 7736, 9670, 11060, 13538, 19340, 22120, 27076, 33845, 38680, 54152, 67690, 76393, 135380, 152786, 270760, 305572, 381965, 534751, 611144, 763930, 1069502, 1527860, 2139004, 2673755, 3055720, 4278008, 5347510, 10695020, 21390040]

約数ペア:

[(1, 21390040), (2, 10695020), (4, 5347510), (5, 4278008), (7, 3055720), (8, 2673755), (10, 2139004), (14, 1527860), (20, 1069502), (28, 763930), (35, 611144), (40, 534751), (56, 381965), (70, 305572), (79, 270760), (140, 152786), (158, 135380), (280, 76393), (316, 67690), (395, 54152), (553, 38680), (632, 33845), (790, 27076), (967, 22120), (1106, 19340), (1580, 13538), (1934, 11060), (2212, 9670), (2765, 7736), (3160, 6769), (3868, 5530), (4424, 4835)]