21339440

素因数分解:

$2^4\times 5^1\times {\mathrm{157}}^1\times {\mathrm{1699}}^1$

素因数の和:1869

約数の個数: 40

約数和(自身を含む): 49959600

約数和(自身を除く): 28620160

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 157, 314, 628, 785, 1256, 1570, 1699, 2512, 3140, 3398, 6280, 6796, 8495, 12560, 13592, 16990, 27184, 33980, 67960, 135920, 266743, 533486, 1066972, 1333715, 2133944, 2667430, 4267888, 5334860, 10669720, 21339440]

約数ペア:

[(1, 21339440), (2, 10669720), (4, 5334860), (5, 4267888), (8, 2667430), (10, 2133944), (16, 1333715), (20, 1066972), (40, 533486), (80, 266743), (157, 135920), (314, 67960), (628, 33980), (785, 27184), (1256, 16990), (1570, 13592), (1699, 12560), (2512, 8495), (3140, 6796), (3398, 6280)]