20945960

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{239}}^1\times {\mathrm{313}}^1$

素因数の和:570

約数の個数: 64

約数和(自身を含む): 54259200

約数和(自身を除く): 33313240

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 239, 280, 313, 478, 626, 956, 1195, 1252, 1565, 1673, 1912, 2191, 2390, 2504, 3130, 3346, 4382, 4780, 6260, 6692, 8365, 8764, 9560, 10955, 12520, 13384, 16730, 17528, 21910, 33460, 43820, 66920, 74807, 87640, 149614, 299228, 374035, 523649, 598456, 748070, 1047298, 1496140, 2094596, 2618245, 2992280, 4189192, 5236490, 10472980, 20945960]

約数ペア:

[(1, 20945960), (2, 10472980), (4, 5236490), (5, 4189192), (7, 2992280), (8, 2618245), (10, 2094596), (14, 1496140), (20, 1047298), (28, 748070), (35, 598456), (40, 523649), (56, 374035), (70, 299228), (140, 149614), (239, 87640), (280, 74807), (313, 66920), (478, 43820), (626, 33460), (956, 21910), (1195, 17528), (1252, 16730), (1565, 13384), (1673, 12520), (1912, 10955), (2191, 9560), (2390, 8764), (2504, 8365), (3130, 6692), (3346, 6260), (4382, 4780)]