20956520

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{191}}^1\times {\mathrm{211}}^1$

素因数の和:426

約数の個数: 64

約数和(自身を含む): 51287040

約数和(自身を除く): 30330520

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 191, 211, 260, 382, 422, 520, 764, 844, 955, 1055, 1528, 1688, 1910, 2110, 2483, 2743, 3820, 4220, 4966, 5486, 7640, 8440, 9932, 10972, 12415, 13715, 19864, 21944, 24830, 27430, 40301, 49660, 54860, 80602, 99320, 109720, 161204, 201505, 322408, 403010, 523913, 806020, 1047826, 1612040, 2095652, 2619565, 4191304, 5239130, 10478260, 20956520]

約数ペア:

[(1, 20956520), (2, 10478260), (4, 5239130), (5, 4191304), (8, 2619565), (10, 2095652), (13, 1612040), (20, 1047826), (26, 806020), (40, 523913), (52, 403010), (65, 322408), (104, 201505), (130, 161204), (191, 109720), (211, 99320), (260, 80602), (382, 54860), (422, 49660), (520, 40301), (764, 27430), (844, 24830), (955, 21944), (1055, 19864), (1528, 13715), (1688, 12415), (1910, 10972), (2110, 9932), (2483, 8440), (2743, 7640), (3820, 5486), (4220, 4966)]