21687939

素因数分解:

$3^3\times 7^2\times {\mathrm{13}}^2\times {\mathrm{97}}^1$

素因数の和:146

約数の個数: 72

約数和(自身を含む): 40889520

約数和(自身を除く): 19201581

約数列:

[1, 3, 7, 9, 13, 21, 27, 39, 49, 63, 91, 97, 117, 147, 169, 189, 273, 291, 351, 441, 507, 637, 679, 819, 873, 1183, 1261, 1323, 1521, 1911, 2037, 2457, 2619, 3549, 3783, 4563, 4753, 5733, 6111, 8281, 8827, 10647, 11349, 14259, 16393, 17199, 18333, 24843, 26481, 31941, 34047, 42777, 49179, 61789, 74529, 79443, 114751, 128331, 147537, 185367, 223587, 238329, 344253, 442611, 556101, 803257, 1032759, 1668303, 2409771, 3098277, 7229313, 21687939]

約数ペア:

[(1, 21687939), (3, 7229313), (7, 3098277), (9, 2409771), (13, 1668303), (21, 1032759), (27, 803257), (39, 556101), (49, 442611), (63, 344253), (91, 238329), (97, 223587), (117, 185367), (147, 147537), (169, 128331), (189, 114751), (273, 79443), (291, 74529), (351, 61789), (441, 49179), (507, 42777), (637, 34047), (679, 31941), (819, 26481), (873, 24843), (1183, 18333), (1261, 17199), (1323, 16393), (1521, 14259), (1911, 11349), (2037, 10647), (2457, 8827), (2619, 8281), (3549, 6111), (3783, 5733), (4563, 4753)]