21391984

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{59}}^1$

素因数の和:158

約数の個数: 80

約数和(自身を含む): 47139840

約数和(自身を除く): 25747856

約数列:

[1, 2, 4, 8, 16, 17, 31, 34, 43, 59, 62, 68, 86, 118, 124, 136, 172, 236, 248, 272, 344, 472, 496, 527, 688, 731, 944, 1003, 1054, 1333, 1462, 1829, 2006, 2108, 2537, 2666, 2924, 3658, 4012, 4216, 5074, 5332, 5848, 7316, 8024, 8432, 10148, 10664, 11696, 14632, 16048, 20296, 21328, 22661, 29264, 31093, 40592, 43129, 45322, 62186, 78647, 86258, 90644, 124372, 157294, 172516, 181288, 248744, 314588, 345032, 362576, 497488, 629176, 690064, 1258352, 1336999, 2673998, 5347996, 10695992, 21391984]

約数ペア:

[(1, 21391984), (2, 10695992), (4, 5347996), (8, 2673998), (16, 1336999), (17, 1258352), (31, 690064), (34, 629176), (43, 497488), (59, 362576), (62, 345032), (68, 314588), (86, 248744), (118, 181288), (124, 172516), (136, 157294), (172, 124372), (236, 90644), (248, 86258), (272, 78647), (344, 62186), (472, 45322), (496, 43129), (527, 40592), (688, 31093), (731, 29264), (944, 22661), (1003, 21328), (1054, 20296), (1333, 16048), (1462, 14632), (1829, 11696), (2006, 10664), (2108, 10148), (2537, 8432), (2666, 8024), (2924, 7316), (3658, 5848), (4012, 5332), (4216, 5074)]