20762721

素因数分解:

$3^2\times 7^2\times {\mathrm{23}}^2\times {\mathrm{89}}^1$

素因数の和:155

約数の個数: 54

約数和(自身を含む): 36879570

約数和(自身を除く): 16116849

約数列:

[1, 3, 7, 9, 21, 23, 49, 63, 69, 89, 147, 161, 207, 267, 441, 483, 529, 623, 801, 1127, 1449, 1587, 1869, 2047, 3381, 3703, 4361, 4761, 5607, 6141, 10143, 11109, 13083, 14329, 18423, 25921, 33327, 39249, 42987, 47081, 77763, 100303, 128961, 141243, 233289, 300909, 329567, 423729, 902727, 988701, 2306969, 2966103, 6920907, 20762721]

約数ペア:

[(1, 20762721), (3, 6920907), (7, 2966103), (9, 2306969), (21, 988701), (23, 902727), (49, 423729), (63, 329567), (69, 300909), (89, 233289), (147, 141243), (161, 128961), (207, 100303), (267, 77763), (441, 47081), (483, 42987), (529, 39249), (623, 33327), (801, 25921), (1127, 18423), (1449, 14329), (1587, 13083), (1869, 11109), (2047, 10143), (3381, 6141), (3703, 5607), (4361, 4761)]