21427287

素因数分解:

$3^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1\times {\mathrm{389}}^1$

素因数の和:503

約数の個数: 32

約数和(自身を含む): 34045440

約数和(自身を除く): 12618153

約数列:

[1, 3, 7, 21, 43, 61, 129, 183, 301, 389, 427, 903, 1167, 1281, 2623, 2723, 7869, 8169, 16727, 18361, 23729, 50181, 55083, 71187, 117089, 166103, 351267, 498309, 1020347, 3061041, 7142429, 21427287]

約数ペア:

[(1, 21427287), (3, 7142429), (7, 3061041), (21, 1020347), (43, 498309), (61, 351267), (129, 166103), (183, 117089), (301, 71187), (389, 55083), (427, 50181), (903, 23729), (1167, 18361), (1281, 16727), (2623, 8169), (2723, 7869)]