20723920

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{1609}}^1$

素因数の和:1652

約数の個数: 80

約数和(自身を含む): 57496320

約数和(自身を除く): 36772400

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 23, 28, 35, 40, 46, 56, 70, 80, 92, 112, 115, 140, 161, 184, 230, 280, 322, 368, 460, 560, 644, 805, 920, 1288, 1609, 1610, 1840, 2576, 3218, 3220, 6436, 6440, 8045, 11263, 12872, 12880, 16090, 22526, 25744, 32180, 37007, 45052, 56315, 64360, 74014, 90104, 112630, 128720, 148028, 180208, 185035, 225260, 259049, 296056, 370070, 450520, 518098, 592112, 740140, 901040, 1036196, 1295245, 1480280, 2072392, 2590490, 2960560, 4144784, 5180980, 10361960, 20723920]

約数ペア:

[(1, 20723920), (2, 10361960), (4, 5180980), (5, 4144784), (7, 2960560), (8, 2590490), (10, 2072392), (14, 1480280), (16, 1295245), (20, 1036196), (23, 901040), (28, 740140), (35, 592112), (40, 518098), (46, 450520), (56, 370070), (70, 296056), (80, 259049), (92, 225260), (112, 185035), (115, 180208), (140, 148028), (161, 128720), (184, 112630), (230, 90104), (280, 74014), (322, 64360), (368, 56315), (460, 45052), (560, 37007), (644, 32180), (805, 25744), (920, 22526), (1288, 16090), (1609, 12880), (1610, 12872), (1840, 11263), (2576, 8045), (3218, 6440), (3220, 6436)]