20812120

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{239}}^1\times {\mathrm{311}}^1$

素因数の和:568

約数の個数: 64

約数和(自身を含む): 53913600

約数和(自身を除く): 33101480

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 239, 280, 311, 478, 622, 956, 1195, 1244, 1555, 1673, 1912, 2177, 2390, 2488, 3110, 3346, 4354, 4780, 6220, 6692, 8365, 8708, 9560, 10885, 12440, 13384, 16730, 17416, 21770, 33460, 43540, 66920, 74329, 87080, 148658, 297316, 371645, 520303, 594632, 743290, 1040606, 1486580, 2081212, 2601515, 2973160, 4162424, 5203030, 10406060, 20812120]

約数ペア:

[(1, 20812120), (2, 10406060), (4, 5203030), (5, 4162424), (7, 2973160), (8, 2601515), (10, 2081212), (14, 1486580), (20, 1040606), (28, 743290), (35, 594632), (40, 520303), (56, 371645), (70, 297316), (140, 148658), (239, 87080), (280, 74329), (311, 66920), (478, 43540), (622, 33460), (956, 21770), (1195, 17416), (1244, 16730), (1555, 13384), (1673, 12440), (1912, 10885), (2177, 9560), (2390, 8708), (2488, 8365), (3110, 6692), (3346, 6220), (4354, 4780)]