21515620

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{313}}^1\times {\mathrm{491}}^1$

素因数の和:820

約数の個数: 48

約数和(自身を含む): 51907968

約数和(自身を除く): 30392348

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 313, 491, 626, 982, 1252, 1565, 1964, 2191, 2455, 3130, 3437, 4382, 4910, 6260, 6874, 8764, 9820, 10955, 13748, 17185, 21910, 34370, 43820, 68740, 153683, 307366, 614732, 768415, 1075781, 1536830, 2151562, 3073660, 4303124, 5378905, 10757810, 21515620]

約数ペア:

[(1, 21515620), (2, 10757810), (4, 5378905), (5, 4303124), (7, 3073660), (10, 2151562), (14, 1536830), (20, 1075781), (28, 768415), (35, 614732), (70, 307366), (140, 153683), (313, 68740), (491, 43820), (626, 34370), (982, 21910), (1252, 17185), (1565, 13748), (1964, 10955), (2191, 9820), (2455, 8764), (3130, 6874), (3437, 6260), (4382, 4910)]