21437865

素因数分解:

$3^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{1231}}^1$

素因数の和:1291

約数の個数: 40

約数和(自身を含む): 39355008

約数和(自身を除く): 17917143

約数列:

[1, 3, 5, 9, 15, 27, 43, 45, 81, 129, 135, 215, 387, 405, 645, 1161, 1231, 1935, 3483, 3693, 5805, 6155, 11079, 17415, 18465, 33237, 52933, 55395, 99711, 158799, 166185, 264665, 476397, 498555, 793995, 1429191, 2381985, 4287573, 7145955, 21437865]

約数ペア:

[(1, 21437865), (3, 7145955), (5, 4287573), (9, 2381985), (15, 1429191), (27, 793995), (43, 498555), (45, 476397), (81, 264665), (129, 166185), (135, 158799), (215, 99711), (387, 55395), (405, 52933), (645, 33237), (1161, 18465), (1231, 17415), (1935, 11079), (3483, 6155), (3693, 5805)]