21370960

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20549}}^1$

素因数の和:20575

約数の個数: 40

約数和(自身を含む): 53512200

約数和(自身を除く): 32141240

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20549, 41098, 82196, 102745, 164392, 205490, 267137, 328784, 410980, 534274, 821960, 1068548, 1335685, 1643920, 2137096, 2671370, 4274192, 5342740, 10685480, 21370960]

約数ペア:

[(1, 21370960), (2, 10685480), (4, 5342740), (5, 4274192), (8, 2671370), (10, 2137096), (13, 1643920), (16, 1335685), (20, 1068548), (26, 821960), (40, 534274), (52, 410980), (65, 328784), (80, 267137), (104, 205490), (130, 164392), (208, 102745), (260, 82196), (520, 41098), (1040, 20549)]