161980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1$

素因数の和:118

約数の個数: 48

約数和(自身を含む): 423360

約数和(自身を除く): 261380

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 52, 65, 70, 89, 91, 130, 140, 178, 182, 260, 356, 364, 445, 455, 623, 890, 910, 1157, 1246, 1780, 1820, 2314, 2492, 3115, 4628, 5785, 6230, 8099, 11570, 12460, 16198, 23140, 32396, 40495, 80990, 161980]

約数ペア:

[(1, 161980), (2, 80990), (4, 40495), (5, 32396), (7, 23140), (10, 16198), (13, 12460), (14, 11570), (20, 8099), (26, 6230), (28, 5785), (35, 4628), (52, 3115), (65, 2492), (70, 2314), (89, 1820), (91, 1780), (130, 1246), (140, 1157), (178, 910), (182, 890), (260, 623), (356, 455), (364, 445)]