21000918068

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{431}}^1\times {\mathrm{19937}}^1$

素因数の和:20432

約数の個数: 48

約数和(自身を含む): 40516568064

約数和(自身を除く): 19515649996

約数列:

[1, 2, 4, 13, 26, 47, 52, 94, 188, 431, 611, 862, 1222, 1724, 2444, 5603, 11206, 19937, 20257, 22412, 39874, 40514, 79748, 81028, 259181, 263341, 518362, 526682, 937039, 1036724, 1053364, 1874078, 3748156, 8592847, 12181507, 17185694, 24363014, 34371388, 48726028, 111707011, 223414022, 403863809, 446828044, 807727618, 1615455236, 5250229517, 10500459034, 21000918068]

約数ペア:

[(1, 21000918068), (2, 10500459034), (4, 5250229517), (13, 1615455236), (26, 807727618), (47, 446828044), (52, 403863809), (94, 223414022), (188, 111707011), (431, 48726028), (611, 34371388), (862, 24363014), (1222, 17185694), (1724, 12181507), (2444, 8592847), (5603, 3748156), (11206, 1874078), (19937, 1053364), (20257, 1036724), (22412, 937039), (39874, 526682), (40514, 518362), (79748, 263341), (81028, 259181)]