20720560

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{163}}^1\times {\mathrm{227}}^1$

素因数の和:410

約数の個数: 80

約数和(自身を含む): 55639296

約数和(自身を除く): 34918736

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 140, 163, 227, 280, 326, 454, 560, 652, 815, 908, 1135, 1141, 1304, 1589, 1630, 1816, 2270, 2282, 2608, 3178, 3260, 3632, 4540, 4564, 5705, 6356, 6520, 7945, 9080, 9128, 11410, 12712, 13040, 15890, 18160, 18256, 22820, 25424, 31780, 37001, 45640, 63560, 74002, 91280, 127120, 148004, 185005, 259007, 296008, 370010, 518014, 592016, 740020, 1036028, 1295035, 1480040, 2072056, 2590070, 2960080, 4144112, 5180140, 10360280, 20720560]

約数ペア:

[(1, 20720560), (2, 10360280), (4, 5180140), (5, 4144112), (7, 2960080), (8, 2590070), (10, 2072056), (14, 1480040), (16, 1295035), (20, 1036028), (28, 740020), (35, 592016), (40, 518014), (56, 370010), (70, 296008), (80, 259007), (112, 185005), (140, 148004), (163, 127120), (227, 91280), (280, 74002), (326, 63560), (454, 45640), (560, 37001), (652, 31780), (815, 25424), (908, 22820), (1135, 18256), (1141, 18160), (1304, 15890), (1589, 13040), (1630, 12712), (1816, 11410), (2270, 9128), (2282, 9080), (2608, 7945), (3178, 6520), (3260, 6356), (3632, 5705), (4540, 4564)]