20898520

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12743}}^1$

素因数の和:12795

約数の個数: 32

約数和(自身を含む): 48172320

約数和(自身を除く): 27273800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12743, 25486, 50972, 63715, 101944, 127430, 254860, 509720, 522463, 1044926, 2089852, 2612315, 4179704, 5224630, 10449260, 20898520]

約数ペア:

[(1, 20898520), (2, 10449260), (4, 5224630), (5, 4179704), (8, 2612315), (10, 2089852), (20, 1044926), (40, 522463), (41, 509720), (82, 254860), (164, 127430), (205, 101944), (328, 63715), (410, 50972), (820, 25486), (1640, 12743)]