21280887

素因数分解:

$3^4\times {\mathrm{59}}^1\times {\mathrm{61}}^1\times {\mathrm{73}}^1$

素因数の和:205

約数の個数: 40

約数和(自身を含む): 33308880

約数和(自身を除く): 12027993

約数列:

[1, 3, 9, 27, 59, 61, 73, 81, 177, 183, 219, 531, 549, 657, 1593, 1647, 1971, 3599, 4307, 4453, 4779, 4941, 5913, 10797, 12921, 13359, 32391, 38763, 40077, 97173, 116289, 120231, 262727, 291519, 348867, 360693, 788181, 2364543, 7093629, 21280887]

約数ペア:

[(1, 21280887), (3, 7093629), (9, 2364543), (27, 788181), (59, 360693), (61, 348867), (73, 291519), (81, 262727), (177, 120231), (183, 116289), (219, 97173), (531, 40077), (549, 38763), (657, 32391), (1593, 13359), (1647, 12921), (1971, 10797), (3599, 5913), (4307, 4941), (4453, 4779)]