21287259

素因数分解:

$3^3\times 7^1\times {\mathrm{23}}^1\times {\mathrm{59}}^1\times {\mathrm{83}}^1$

素因数の和:181

約数の個数: 64

約数和(自身を含む): 38707200

約数和(自身を除く): 17419941

約数列:

[1, 3, 7, 9, 21, 23, 27, 59, 63, 69, 83, 161, 177, 189, 207, 249, 413, 483, 531, 581, 621, 747, 1239, 1357, 1449, 1593, 1743, 1909, 2241, 3717, 4071, 4347, 4897, 5229, 5727, 9499, 11151, 12213, 13363, 14691, 15687, 17181, 28497, 34279, 36639, 40089, 44073, 51543, 85491, 102837, 112631, 120267, 132219, 256473, 308511, 337893, 360801, 788417, 925533, 1013679, 2365251, 3041037, 7095753, 21287259]

約数ペア:

[(1, 21287259), (3, 7095753), (7, 3041037), (9, 2365251), (21, 1013679), (23, 925533), (27, 788417), (59, 360801), (63, 337893), (69, 308511), (83, 256473), (161, 132219), (177, 120267), (189, 112631), (207, 102837), (249, 85491), (413, 51543), (483, 44073), (531, 40089), (581, 36639), (621, 34279), (747, 28497), (1239, 17181), (1357, 15687), (1449, 14691), (1593, 13363), (1743, 12213), (1909, 11151), (2241, 9499), (3717, 5727), (4071, 5229), (4347, 4897)]