20879950

素因数分解:

$2^1\times 5^2\times 7^1\times {\mathrm{13}}^2\times {\mathrm{353}}^1$

素因数の和:398

約数の個数: 72

約数和(自身を含む): 48197808

約数和(自身を除く): 27317858

約数列:

[1, 2, 5, 7, 10, 13, 14, 25, 26, 35, 50, 65, 70, 91, 130, 169, 175, 182, 325, 338, 350, 353, 455, 650, 706, 845, 910, 1183, 1690, 1765, 2275, 2366, 2471, 3530, 4225, 4550, 4589, 4942, 5915, 8450, 8825, 9178, 11830, 12355, 17650, 22945, 24710, 29575, 32123, 45890, 59150, 59657, 61775, 64246, 114725, 119314, 123550, 160615, 229450, 298285, 321230, 417599, 596570, 803075, 835198, 1491425, 1606150, 2087995, 2982850, 4175990, 10439975, 20879950]

約数ペア:

[(1, 20879950), (2, 10439975), (5, 4175990), (7, 2982850), (10, 2087995), (13, 1606150), (14, 1491425), (25, 835198), (26, 803075), (35, 596570), (50, 417599), (65, 321230), (70, 298285), (91, 229450), (130, 160615), (169, 123550), (175, 119314), (182, 114725), (325, 64246), (338, 61775), (350, 59657), (353, 59150), (455, 45890), (650, 32123), (706, 29575), (845, 24710), (910, 22945), (1183, 17650), (1690, 12355), (1765, 11830), (2275, 9178), (2366, 8825), (2471, 8450), (3530, 5915), (4225, 4942), (4550, 4589)]