21369968

素因数分解:

$2^4\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{349}}^1$

素因数の和:489

約数の個数: 40

約数和(自身を含む): 42966000

約数和(自身を除く): 21596032

約数列:

[1, 2, 4, 8, 16, 43, 86, 89, 172, 178, 344, 349, 356, 688, 698, 712, 1396, 1424, 2792, 3827, 5584, 7654, 15007, 15308, 30014, 30616, 31061, 60028, 61232, 62122, 120056, 124244, 240112, 248488, 496976, 1335623, 2671246, 5342492, 10684984, 21369968]

約数ペア:

[(1, 21369968), (2, 10684984), (4, 5342492), (8, 2671246), (16, 1335623), (43, 496976), (86, 248488), (89, 240112), (172, 124244), (178, 120056), (344, 62122), (349, 61232), (356, 60028), (688, 31061), (698, 30616), (712, 30014), (1396, 15308), (1424, 15007), (2792, 7654), (3827, 5584)]