21472731

素因数分解:

$3^2\times 7^2\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{73}}^1$

素因数の和:145

約数の個数: 72

約数和(自身を含む): 39480480

約数和(自身を除く): 18007749

約数列:

[1, 3, 7, 9, 21, 23, 29, 49, 63, 69, 73, 87, 147, 161, 203, 207, 219, 261, 441, 483, 511, 609, 657, 667, 1127, 1421, 1449, 1533, 1679, 1827, 2001, 2117, 3381, 3577, 4263, 4599, 4669, 5037, 6003, 6351, 10143, 10731, 11753, 12789, 14007, 14819, 15111, 19053, 32193, 32683, 35259, 42021, 44457, 48691, 82271, 98049, 103733, 105777, 133371, 146073, 246813, 294147, 311199, 340837, 438219, 740439, 933597, 1022511, 2385859, 3067533, 7157577, 21472731]

約数ペア:

[(1, 21472731), (3, 7157577), (7, 3067533), (9, 2385859), (21, 1022511), (23, 933597), (29, 740439), (49, 438219), (63, 340837), (69, 311199), (73, 294147), (87, 246813), (147, 146073), (161, 133371), (203, 105777), (207, 103733), (219, 98049), (261, 82271), (441, 48691), (483, 44457), (511, 42021), (609, 35259), (657, 32683), (667, 32193), (1127, 19053), (1421, 15111), (1449, 14819), (1533, 14007), (1679, 12789), (1827, 11753), (2001, 10731), (2117, 10143), (3381, 6351), (3577, 6003), (4263, 5037), (4599, 4669)]