21990514

素因数分解:

$2^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{421}}^1$

素因数の和:491

約数の個数: 48

約数和(自身を含む): 42431256

約数和(自身を除く): 20440742

約数列:

[1, 2, 7, 13, 14, 26, 41, 49, 82, 91, 98, 182, 287, 421, 533, 574, 637, 842, 1066, 1274, 2009, 2947, 3731, 4018, 5473, 5894, 7462, 10946, 17261, 20629, 26117, 34522, 38311, 41258, 52234, 76622, 120827, 224393, 241654, 268177, 448786, 536354, 845789, 1570751, 1691578, 3141502, 10995257, 21990514]

約数ペア:

[(1, 21990514), (2, 10995257), (7, 3141502), (13, 1691578), (14, 1570751), (26, 845789), (41, 536354), (49, 448786), (82, 268177), (91, 241654), (98, 224393), (182, 120827), (287, 76622), (421, 52234), (533, 41258), (574, 38311), (637, 34522), (842, 26117), (1066, 20629), (1274, 17261), (2009, 10946), (2947, 7462), (3731, 5894), (4018, 5473)]