20721350

素因数分解:

$2^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{449}}^1$

素因数の和:545

約数の個数: 48

約数和(自身を含む): 42184800

約数和(自身を除く): 21463450

約数列:

[1, 2, 5, 10, 13, 25, 26, 50, 65, 71, 130, 142, 325, 355, 449, 650, 710, 898, 923, 1775, 1846, 2245, 3550, 4490, 4615, 5837, 9230, 11225, 11674, 22450, 23075, 29185, 31879, 46150, 58370, 63758, 145925, 159395, 291850, 318790, 414427, 796975, 828854, 1593950, 2072135, 4144270, 10360675, 20721350]

約数ペア:

[(1, 20721350), (2, 10360675), (5, 4144270), (10, 2072135), (13, 1593950), (25, 828854), (26, 796975), (50, 414427), (65, 318790), (71, 291850), (130, 159395), (142, 145925), (325, 63758), (355, 58370), (449, 46150), (650, 31879), (710, 29185), (898, 23075), (923, 22450), (1775, 11674), (1846, 11225), (2245, 9230), (3550, 5837), (4490, 4615)]