21065751

素因数分解:

$3^4\times 7^1\times {\mathrm{53}}^1\times {\mathrm{701}}^1$

素因数の和:773

約数の個数: 40

約数和(自身を含む): 36694944

約数和(自身を除く): 15629193

約数列:

[1, 3, 7, 9, 21, 27, 53, 63, 81, 159, 189, 371, 477, 567, 701, 1113, 1431, 2103, 3339, 4293, 4907, 6309, 10017, 14721, 18927, 30051, 37153, 44163, 56781, 111459, 132489, 260071, 334377, 397467, 780213, 1003131, 2340639, 3009393, 7021917, 21065751]

約数ペア:

[(1, 21065751), (3, 7021917), (7, 3009393), (9, 2340639), (21, 1003131), (27, 780213), (53, 397467), (63, 334377), (81, 260071), (159, 132489), (189, 111459), (371, 56781), (477, 44163), (567, 37153), (701, 30051), (1113, 18927), (1431, 14721), (2103, 10017), (3339, 6309), (4293, 4907)]