21507080

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{10973}}^1$

素因数の和:10998

約数の個数: 48

約数和(自身を含む): 56296620

約数和(自身を除く): 34789540

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 49, 56, 70, 98, 140, 196, 245, 280, 392, 490, 980, 1960, 10973, 21946, 43892, 54865, 76811, 87784, 109730, 153622, 219460, 307244, 384055, 438920, 537677, 614488, 768110, 1075354, 1536220, 2150708, 2688385, 3072440, 4301416, 5376770, 10753540, 21507080]

約数ペア:

[(1, 21507080), (2, 10753540), (4, 5376770), (5, 4301416), (7, 3072440), (8, 2688385), (10, 2150708), (14, 1536220), (20, 1075354), (28, 768110), (35, 614488), (40, 537677), (49, 438920), (56, 384055), (70, 307244), (98, 219460), (140, 153622), (196, 109730), (245, 87784), (280, 76811), (392, 54865), (490, 43892), (980, 21946), (1960, 10973)]