21493899

素因数分解:

$3^2\times 7^2\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{61}}^1$

素因数の和:145

約数の個数: 72

約数和(自身を含む): 39693888

約数和(自身を除く): 18199989

約数列:

[1, 3, 7, 9, 17, 21, 47, 49, 51, 61, 63, 119, 141, 147, 153, 183, 329, 357, 423, 427, 441, 549, 799, 833, 987, 1037, 1071, 1281, 2303, 2397, 2499, 2867, 2961, 2989, 3111, 3843, 5593, 6909, 7191, 7259, 7497, 8601, 8967, 9333, 16779, 20069, 20727, 21777, 25803, 26901, 39151, 48739, 50337, 50813, 60207, 65331, 117453, 140483, 146217, 152439, 180621, 341173, 352359, 421449, 438651, 457317, 1023519, 1264347, 2388211, 3070557, 7164633, 21493899]

約数ペア:

[(1, 21493899), (3, 7164633), (7, 3070557), (9, 2388211), (17, 1264347), (21, 1023519), (47, 457317), (49, 438651), (51, 421449), (61, 352359), (63, 341173), (119, 180621), (141, 152439), (147, 146217), (153, 140483), (183, 117453), (329, 65331), (357, 60207), (423, 50813), (427, 50337), (441, 48739), (549, 39151), (799, 26901), (833, 25803), (987, 21777), (1037, 20727), (1071, 20069), (1281, 16779), (2303, 9333), (2397, 8967), (2499, 8601), (2867, 7497), (2961, 7259), (2989, 7191), (3111, 6909), (3843, 5593)]