20987760

素因数分解:

$2^4\times 3^1\times 5^1\times {\mathrm{157}}^1\times {\mathrm{557}}^1$

素因数の和:730

約数の個数: 80

約数和(自身を含む): 65594016

約数和(自身を除く): 44606256

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120, 157, 240, 314, 471, 557, 628, 785, 942, 1114, 1256, 1570, 1671, 1884, 2228, 2355, 2512, 2785, 3140, 3342, 3768, 4456, 4710, 5570, 6280, 6684, 7536, 8355, 8912, 9420, 11140, 12560, 13368, 16710, 18840, 22280, 26736, 33420, 37680, 44560, 66840, 87449, 133680, 174898, 262347, 349796, 437245, 524694, 699592, 874490, 1049388, 1311735, 1399184, 1748980, 2098776, 2623470, 3497960, 4197552, 5246940, 6995920, 10493880, 20987760]

約数ペア:

[(1, 20987760), (2, 10493880), (3, 6995920), (4, 5246940), (5, 4197552), (6, 3497960), (8, 2623470), (10, 2098776), (12, 1748980), (15, 1399184), (16, 1311735), (20, 1049388), (24, 874490), (30, 699592), (40, 524694), (48, 437245), (60, 349796), (80, 262347), (120, 174898), (157, 133680), (240, 87449), (314, 66840), (471, 44560), (557, 37680), (628, 33420), (785, 26736), (942, 22280), (1114, 18840), (1256, 16710), (1570, 13368), (1671, 12560), (1884, 11140), (2228, 9420), (2355, 8912), (2512, 8355), (2785, 7536), (3140, 6684), (3342, 6280), (3768, 5570), (4456, 4710)]