21665605

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{331}}^1$

素因数の和:421

約数の個数: 32

約数和(自身を含む): 30119040

約数和(自身を除く): 8453435

約数列:

[1, 5, 13, 19, 53, 65, 95, 247, 265, 331, 689, 1007, 1235, 1655, 3445, 4303, 5035, 6289, 13091, 17543, 21515, 31445, 65455, 81757, 87715, 228059, 333317, 408785, 1140295, 1666585, 4333121, 21665605]

約数ペア:

[(1, 21665605), (5, 4333121), (13, 1666585), (19, 1140295), (53, 408785), (65, 333317), (95, 228059), (247, 87715), (265, 81757), (331, 65455), (689, 31445), (1007, 21515), (1235, 17543), (1655, 13091), (3445, 6289), (4303, 5035)]